Scenario Analysis - Revision history

Fouad.Alkhouri: Removed dead link for guide to scenario analysis

2023-02-17T00:27:07Z

Removed dead link for guide to scenario analysis

← Older revision		Revision as of 00:27, 17 February 2023
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	== <span style="font-size:x-large;">Parameter Types</span> ==		== <span style="font-size:x-large;">Parameter Types</span> ==

	Parameters are numbers that determine relationships among variables in the equations of IFs. You often set parameters to a single value across time and they therefore do not always "vary" as do "real" variables. Many parameters are "policy handles." More generally, parameters can actually be thought of as a special type of variable, the value of which you set in order to determine the behavior of the model. See the IFs project document called ~~[http://pardee.du.edu/working-papers~~ Guide to Scenario Analysis] for much more information on parameter types and especially on the important parameters of IFs, organized by the models of the IFs system.		Parameters are numbers that determine relationships among variables in the equations of IFs. You often set parameters to a single value across time and they therefore do not always "vary" as do "real" variables. Many parameters are "policy handles." More generally, parameters can actually be thought of as a special type of variable, the value of which you set in order to determine the behavior of the model. See the IFs project document called Guide to Scenario Analysis for much more information on parameter types and especially on the important parameters of IFs, organized by the models of the IFs system.

	'''Multipliers:''' They have a normal value of 1, and to increase whatever they multiply (say agricultural yield) by 50 percent you increase the parameter to 1.5. To decrease it by 25 percent you would decrease the multiplier parameter to 0.75. You will almost always spread such changes out over time, keeping the multiplier's value at 1 in the base year and gradually increasing or decreasing it over a period of years. You should almost never change a multiplier in the initial year because the model is set up to provide accurate results for that year and will compensate for and thereby offset your change. For instance, if you set a multiplier on agricultural production equal to 1.5 for the first year and all years thereafter, you might find that the results were no different than in the base case. You must instead gradually introduce your change, preserving the multiplier value of "1" in the initial year. Examples of multipliers include: agdemm, enpm, freedomm, mortm, protecm, qem, rdm, resorm, tfrm, and ylm. Note that multipliers typically end with the letter "m".		'''Multipliers:''' They have a normal value of 1, and to increase whatever they multiply (say agricultural yield) by 50 percent you increase the parameter to 1.5. To decrease it by 25 percent you would decrease the multiplier parameter to 0.75. You will almost always spread such changes out over time, keeping the multiplier's value at 1 in the base year and gradually increasing or decreasing it over a period of years. You should almost never change a multiplier in the initial year because the model is set up to provide accurate results for that year and will compensate for and thereby offset your change. For instance, if you set a multiplier on agricultural production equal to 1.5 for the first year and all years thereafter, you might find that the results were no different than in the base case. You must instead gradually introduce your change, preserving the multiplier value of "1" in the initial year. Examples of multipliers include: agdemm, enpm, freedomm, mortm, protecm, qem, rdm, resorm, tfrm, and ylm. Note that multipliers typically end with the letter "m".

Wikiadmin at 21:33, 1 August 2018

2018-08-01T21:33:22Z

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	[[File:Useifs39.png\|frame\|right\|Change Bi-Variate Functions window]]		[[File:Useifs39.png\|frame\|right\|Change Bi-Variate Functions window]]

	To see the full list of functions or relationships that you can change in IFs, check Extend List. Click on any of the function names (relationships) in the Functions list box in order to see the relationship already in IFs. When you click a graphic of the function will be displayed in the lower right of the window. Many of the functions will also display the r-squared and standard error (SE) that indicate the strength of the relationship that we found when creating it via [~~http://www~~.~~du.edu/ifs/help/use~~-~~online/data/crosssectional/index~~.~~html~~ cross-sectional analysis] of our database.		To see the full list of functions or relationships that you can change in IFs, check Extend List. Click on any of the function names (relationships) in the Functions list box in order to see the relationship already in IFs. When you click a graphic of the function will be displayed in the lower right of the window. Many of the functions will also display the r-squared and standard error (SE) that indicate the strength of the relationship that we found when creating it via [[Data_Analysis#Analyze_Across_Countries_.28Cross-Sectional_Analysis.29\|cross-sectional analysis]] of our database.

	Our creation of the functions was sometimes to use in computations of the model run from the base year, sometimes to be used in the historical run, and sometimes in the model's data preprocessor to fill holes and clean up data (again, for either historical forecasts or those looking forward). The options in the upper right are all checked by default, but if you wanted to see only those functions used in the model run, you could turn off all of the other checks. This window actually gives you the opportunity to revise the functions used in the model run.		Our creation of the functions was sometimes to use in computations of the model run from the base year, sometimes to be used in the historical run, and sometimes in the model's data preprocessor to fill holes and clean up data (again, for either historical forecasts or those looking forward). The options in the upper right are all checked by default, but if you wanted to see only those functions used in the model run, you could turn off all of the other checks. This window actually gives you the opportunity to revise the functions used in the model run.

EmoryFerguson at 20:08, 27 July 2017

2017-07-27T20:08:03Z

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	= <span style="font-size:xx-large;">Running Working Scenario</span> =		= <span style="font-size:xx-large;">Running Working Scenario</span> =

	The Run option can be found by selecting Scenario Analysis from the Main Menu.		The Run option can be found by selecting Scenario Analysis from the Main Menu.[[File:Useifs42.PNG\|frame\|right\|Running Working Scenario Window]]

	Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [[#Quick_Scenario_Analysis_with_Tree_Overview\|Quick Scenario Analysis with Tree]]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.~~[[File:Useifs42.PNG\|frame\|right\|Running Working Scenario Window]]~~		Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [[#Quick_Scenario_Analysis_with_Tree_Overview\|Quick Scenario Analysis with Tree]]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.

	Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [[#Exploring_and_Changing_Parameters_2\|Run]] option from that form. It will also take them to this form for Running (the) Working Scenario.		Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [[#Exploring_and_Changing_Parameters_2\|Run]] option from that form. It will also take them to this form for Running (the) Working Scenario.

EmoryFerguson at 20:07, 27 July 2017

2017-07-27T20:07:41Z

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	The main menu of Quick Scenario Analysis with Tree (found under Scenario Analysis from the Main Menu of IFs) provides you with a "tree" on the left hand side of the screen. This tree (Scenario Tree) represents all of the parameters and many of the initial conditions for variables used in IFs.		The main menu of Quick Scenario Analysis with Tree (found under Scenario Analysis from the Main Menu of IFs) provides you with a "tree" on the left hand side of the screen. This tree (Scenario Tree) represents all of the parameters and many of the initial conditions for variables used in IFs.

	One way to find the parameter or variable initial condition you would like to change is to understand the general groupings of these categories (the main and secondary branches of the tree). The first two options or large branches on the tree, Technological Change and Environmental Uncertainties, lead you to primary parameters that allow you to shape the speed of technological change and the intensity of various environmental trends or constraints. The third, fourth and fifth main options on the tree, Households/Individuals, Governments/Social-Political Systems and Firms/Businesses, allow you to find and shape the primary parameters for the three main global actor categories. The Selected Initial Conditions option leads you to some of those for key IFs variables. Finally, the Relationship Parameters branch or option allows you to change all other model parameters in the model that are not identified in the branches above. Whereas most of the parameters accessed in the other branches are primary for scenario analysis, most of those opened by this branch more technically control model specifications and are unlikely to be altered by most users.		One way to find the parameter or variable initial condition you would like to change is to understand the general groupings of these categories (the main and secondary branches of the tree). The first two options or large branches on the tree, Technological Change and Environmental Uncertainties, lead you to primary parameters that allow you to shape the speed of technological change and the intensity of various environmental trends or constraints. The third, fourth and fifth main options on the tree, Households/Individuals, Governments/Social-Political Systems and Firms/Businesses, allow you to find and shape the primary parameters for the three main global actor categories. The Selected Initial Conditions option leads you to some of those for key IFs variables. Finally, the Relationship Parameters branch or option allows you to change all other model parameters in the model that are not identified in the branches above. Whereas most of the parameters accessed in the other branches are primary for scenario analysis, most of those opened by this branch more technically control model specifications and are unlikely to be altered by most users.[[File:Useifs37.png\|frame\|right\|Parameter search window]]

	Another way for you to find the parameters you would like to change is by selecting the Parameter Search option near the right end of the form's menu. Clicking on this will bring up a window with a search box, as shown below. For example, if you are looking to work with the malnourished children parameters, type in "malnourished" and hit enter. This will bring up any parameter or variable initial condition with the word "malnourished" in its name or definition. You can also search for the parameter or variable by its name in IFs (like MALNCHP).  If you know the parameter or initial condition you want to change (or its likely general characterization), it is often easier to search for it with this feature rather than by digging down into the branches of the tree. ~~[[File:Useifs37.png\|frame\|right\|Parameter search window]]~~		Another way for you to find the parameters you would like to change is by selecting the Parameter Search option near the right end of the form's menu. Clicking on this will bring up a window with a search box, as shown below. For example, if you are looking to work with the malnourished children parameters, type in "malnourished" and hit enter. This will bring up any parameter or variable initial condition with the word "malnourished" in its name or definition. You can also search for the parameter or variable by its name in IFs (like MALNCHP).  If you know the parameter or initial condition you want to change (or its likely general characterization), it is often easier to search for it with this feature rather than by digging down into the branches of the tree.

	From this window you can accomplish the following:		From this window you can accomplish the following:

EmoryFerguson at 20:07, 27 July 2017

2017-07-27T20:07:23Z

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	One way to find the parameter or variable initial condition you would like to change is to understand the general groupings of these categories (the main and secondary branches of the tree). The first two options or large branches on the tree, Technological Change and Environmental Uncertainties, lead you to primary parameters that allow you to shape the speed of technological change and the intensity of various environmental trends or constraints. The third, fourth and fifth main options on the tree, Households/Individuals, Governments/Social-Political Systems and Firms/Businesses, allow you to find and shape the primary parameters for the three main global actor categories. The Selected Initial Conditions option leads you to some of those for key IFs variables. Finally, the Relationship Parameters branch or option allows you to change all other model parameters in the model that are not identified in the branches above. Whereas most of the parameters accessed in the other branches are primary for scenario analysis, most of those opened by this branch more technically control model specifications and are unlikely to be altered by most users.		One way to find the parameter or variable initial condition you would like to change is to understand the general groupings of these categories (the main and secondary branches of the tree). The first two options or large branches on the tree, Technological Change and Environmental Uncertainties, lead you to primary parameters that allow you to shape the speed of technological change and the intensity of various environmental trends or constraints. The third, fourth and fifth main options on the tree, Households/Individuals, Governments/Social-Political Systems and Firms/Businesses, allow you to find and shape the primary parameters for the three main global actor categories. The Selected Initial Conditions option leads you to some of those for key IFs variables. Finally, the Relationship Parameters branch or option allows you to change all other model parameters in the model that are not identified in the branches above. Whereas most of the parameters accessed in the other branches are primary for scenario analysis, most of those opened by this branch more technically control model specifications and are unlikely to be altered by most users.

	Another way for you to find the parameters you would like to change is by selecting the Parameter Search option near the right end of the form's menu. Clicking on this will bring up a window with a search box, as shown below. For example, if you are looking to work with the malnourished children parameters, type in "malnourished" and hit enter. This will bring up any parameter or variable initial condition with the word "malnourished" in its name or definition. You can also search for the parameter or variable by its name in IFs (like MALNCHP).  If you know the parameter or initial condition you want to change (or its likely general characterization), it is often easier to search for it with this feature rather than by digging down into the branches of the tree.		Another way for you to find the parameters you would like to change is by selecting the Parameter Search option near the right end of the form's menu. Clicking on this will bring up a window with a search box, as shown below. For example, if you are looking to work with the malnourished children parameters, type in "malnourished" and hit enter. This will bring up any parameter or variable initial condition with the word "malnourished" in its name or definition. You can also search for the parameter or variable by its name in IFs (like MALNCHP).  If you know the parameter or initial condition you want to change (or its likely general characterization), it is often easier to search for it with this feature rather than by digging down into the branches of the tree. [[File:Useifs37.png\|frame\|right\|Parameter search window]]

	[[File:Useifs37.png\|frame\|right\|Parameter search window]]

	From this window you can accomplish the following:		From this window you can accomplish the following:

EmoryFerguson at 20:07, 27 July 2017

2017-07-27T20:07:02Z

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	The Quick Scenario Analysis with Tree allows you to call up or to mix and match an extensive number of your own interventions and/or a set of stored scenario intervention files. This feature of IFs allows you to change any parameter and selected initial conditions used in the model, thus shaping forecasts. Use the Quick Scenario Analysis with Tree to create Scenario-Load-Files and/or run scenario files through IFs in order to create Run-Result-Files that you can use throughout IFs.		The Quick Scenario Analysis with Tree allows you to call up or to mix and match an extensive number of your own interventions and/or a set of stored scenario intervention files. This feature of IFs allows you to change any parameter and selected initial conditions used in the model, thus shaping forecasts. Use the Quick Scenario Analysis with Tree to create Scenario-Load-Files and/or run scenario files through IFs in order to create Run-Result-Files that you can use throughout IFs.

	Below is the main menu of the Quick Scenario Analysis with Tree: [[File:Quicktree.png\|center\|~~Quicktree.png~~]]		Below is the main menu of the Quick Scenario Analysis with Tree: [[File:Quicktree.png\|frame\|center\|Quick Scenario Analysis with Tree Main Menu]]

	=== <span style="font-size:medium;">Loading Previously-Structured Scenarios</span> ===		=== <span style="font-size:medium;">Loading Previously-Structured Scenarios</span> ===
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	There are two different ways of loading .sce files: the Add Scenario Component option (usually the easier of the two options) and the Open/Other sub-option under Scenario Files. Although the format of the two is different, the functionality is the same. From the main menu of Quick Scenario Analysis with Tree (reached with the Scenario Analysis option from the Main Menu of IFs), select Add Scenario Component and you will be presented with a drop-down list with the names of categories in which you can find different previously-structured scenarios, as shown below (the ultimate scenario names are often in sub-categories or even sub-sub categories because there are a large number of previously structured scenarios in IFs for your use). These scenarios can also be reached by clicking on the Scenario Files option (sub-option Open).		There are two different ways of loading .sce files: the Add Scenario Component option (usually the easier of the two options) and the Open/Other sub-option under Scenario Files. Although the format of the two is different, the functionality is the same. From the main menu of Quick Scenario Analysis with Tree (reached with the Scenario Analysis option from the Main Menu of IFs), select Add Scenario Component and you will be presented with a drop-down list with the names of categories in which you can find different previously-structured scenarios, as shown below (the ultimate scenario names are often in sub-categories or even sub-sub categories because there are a large number of previously structured scenarios in IFs for your use). These scenarios can also be reached by clicking on the Scenario Files option (sub-option Open).

	[[File:Useifs36.png\|center\|~~Useifs36.png~~]]		[[File:Useifs36.png\|frame\|center\|Previously-structured scenarios in main menu]]

	Any of the previously-structured scenarios can be loaded into the Scenario Tree of IFs. You can also create a larger scenario in the tree by adding several smaller scenarios together. Once you have loaded a scenario into the tree (experiment by doing so), if you would like to know more about the parameter changes from the Base Case that make up the scenario, click on Explain Scenario located on the menu.		Any of the previously-structured scenarios can be loaded into the Scenario Tree of IFs. You can also create a larger scenario in the tree by adding several smaller scenarios together. Once you have loaded a scenario into the tree (experiment by doing so), if you would like to know more about the parameter changes from the Base Case that make up the scenario, click on Explain Scenario located on the menu.
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	Another way for you to find the parameters you would like to change is by selecting the Parameter Search option near the right end of the form's menu. Clicking on this will bring up a window with a search box, as shown below. For example, if you are looking to work with the malnourished children parameters, type in "malnourished" and hit enter. This will bring up any parameter or variable initial condition with the word "malnourished" in its name or definition. You can also search for the parameter or variable by its name in IFs (like MALNCHP).  If you know the parameter or initial condition you want to change (or its likely general characterization), it is often easier to search for it with this feature rather than by digging down into the branches of the tree.		Another way for you to find the parameters you would like to change is by selecting the Parameter Search option near the right end of the form's menu. Clicking on this will bring up a window with a search box, as shown below. For example, if you are looking to work with the malnourished children parameters, type in "malnourished" and hit enter. This will bring up any parameter or variable initial condition with the word "malnourished" in its name or definition. You can also search for the parameter or variable by its name in IFs (like MALNCHP).  If you know the parameter or initial condition you want to change (or its likely general characterization), it is often easier to search for it with this feature rather than by digging down into the branches of the tree.

	[[File:Useifs37.png\|~~center~~\|~~Useifs37.png~~]]		[[File:Useifs37.png\|frame\|right\|Parameter search window]]

	From this window you can accomplish the following:		From this window you can accomplish the following:
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	*'''Continue:''' Click here if you would like to return to the scenario tree and its menu.		*'''Continue:''' Click here if you would like to return to the scenario tree and its menu.

	Clicking on and selecting a parameter or variable name for initial condition will bring up a small pop-up menu with the following three options to get more information about it: [[Repeated_Features#Define, ~~Drivers~~, ~~Explain~~, ~~Code and Delete~~\|Define, Block Diagram and Equations]].		Clicking on and selecting a parameter or variable name for initial condition will bring up a small pop-up menu with the following three options to get more information about it: [[Repeated_Features#Define,_Drivers,_Explain,_Code_and_Delete\|Define, Block Diagram and Equations]].

	== <span style="font-size:x-large;">Exploring and Changing Parameters</span> ==		== <span style="font-size:x-large;">Exploring and Changing Parameters</span> ==
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	The image below shows you what becomes available to you if you click on a branch on the tree on the left side of the form, thereby generating the box of parameters accessible to you from that branch (see the box in the lower-right of the figure), and then click on the name of a specific parameter in the box (as with tfrm in the example). You are presented with five options in the pop-up: 1) Select the parameter in order to change it; 2) click on Drivers in order to see what variables are affecting what (may be de-activated); 3) click on Explain to see a causal diagram and an explanation of what this parameter affects; 4) click on View Equations to see the mathematical equations that link this parameter to variables; 5) click on Define to see a brief definition of what the parameter is and what it does.		The image below shows you what becomes available to you if you click on a branch on the tree on the left side of the form, thereby generating the box of parameters accessible to you from that branch (see the box in the lower-right of the figure), and then click on the name of a specific parameter in the box (as with tfrm in the example). You are presented with five options in the pop-up: 1) Select the parameter in order to change it; 2) click on Drivers in order to see what variables are affecting what (may be de-activated); 3) click on Explain to see a causal diagram and an explanation of what this parameter affects; 4) click on View Equations to see the mathematical equations that link this parameter to variables; 5) click on Define to see a brief definition of what the parameter is and what it does.

	[[File:Useifs38.png\|center\|~~Useifs38.png~~]]		[[File:Useifs38.png\|frame\|center\|Parameter selection window]]

	In order to effectively use the Scenario Tree to change values, it is very useful to understand the different parameter types in the IFs system.  See the [[#Parameter_Types\|Parameter Types topic]].  In the case of the ''tfrm'' parameter, it is a multiplier with a value of 1.0 in the Base Case. Because you selected a multiplier, the base-case value is always "1"—the model uses multipliers to easily raise or lower base-case values of many variables, and the multipliers are always "1" in the Base Case, so that values are unchanged by them. A multiplier can be distinguished from a variable because the ending of most multiplier abbreviations is the letter "m" such as tfrm.		In order to effectively use the Scenario Tree to change values, it is very useful to understand the different parameter types in the IFs system.  See the [[#Parameter_Types\|Parameter Types topic]].  In the case of the ''tfrm'' parameter, it is a multiplier with a value of 1.0 in the Base Case. Because you selected a multiplier, the base-case value is always "1"—the model uses multipliers to easily raise or lower base-case values of many variables, and the multipliers are always "1" in the Base Case, so that values are unchanged by them. A multiplier can be distinguished from a variable because the ending of most multiplier abbreviations is the letter "m" such as tfrm.
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	Begin at the Main Menu of IFs. Choose the Change Selected Functions option under Scenario Analysis. Then choose the Bivariate Functions sub-option. That will give you the Change Bi-Variate Functions window, below.		Begin at the Main Menu of IFs. Choose the Change Selected Functions option under Scenario Analysis. Then choose the Bivariate Functions sub-option. That will give you the Change Bi-Variate Functions window, below.

	[[File:Useifs39.png\|~~center~~]]		[[File:Useifs39.png\|frame\|right\|Change Bi-Variate Functions window]]

	To see the full list of functions or relationships that you can change in IFs, check Extend List. Click on any of the function names (relationships) in the Functions list box in order to see the relationship already in IFs. When you click a graphic of the function will be displayed in the lower right of the window. Many of the functions will also display the r-squared and standard error (SE) that indicate the strength of the relationship that we found when creating it via [http://www.du.edu/ifs/help/use-online/data/crosssectional/index.html cross-sectional analysis] of our database.		To see the full list of functions or relationships that you can change in IFs, check Extend List. Click on any of the function names (relationships) in the Functions list box in order to see the relationship already in IFs. When you click a graphic of the function will be displayed in the lower right of the window. Many of the functions will also display the r-squared and standard error (SE) that indicate the strength of the relationship that we found when creating it via [http://www.du.edu/ifs/help/use-online/data/crosssectional/index.html cross-sectional analysis] of our database.
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	Option B for Specifying Relationships: '''Analytic Functions (Equations)'''. Click again on the "A Function to Play With" relationship. This time, however, touch the Analytic Function button in the lower left to call up the following screen.		Option B for Specifying Relationships: '''Analytic Functions (Equations)'''. Click again on the "A Function to Play With" relationship. This time, however, touch the Analytic Function button in the lower left to call up the following screen.

	[[File:Useifs40.PNG\|~~center~~]]		[[File:Useifs40.PNG\|frame\|right\|Specify Analytic Function window]]

	If you do not understand equations, you may want to skip this part of the lesson – table functions can serve you well. But you can create a simple analytical function by specifying the constant (a) as 20 and the logarithmic parameter (b4) as 3. Leave the other parameters at 0. Note that by selectively specifying various parameters you can create a wide variety of analytic functions (including most of those that Excel will create when you fit lines to scatter plots). You may also specify the lower and upper range over which you will allow the independent variable to vary. For instance, you may not want the independent variable to be negative.		If you do not understand equations, you may want to skip this part of the lesson – table functions can serve you well. But you can create a simple analytical function by specifying the constant (a) as 20 and the logarithmic parameter (b4) as 3. Leave the other parameters at 0. Note that by selectively specifying various parameters you can create a wide variety of analytic functions (including most of those that Excel will create when you fit lines to scatter plots). You may also specify the lower and upper range over which you will allow the independent variable to vary. For instance, you may not want the independent variable to be negative.
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	Begin at the Main Menu of IFs. Choose the Change Selected Functions option under Scenario Analysis. Then choose the Multivariate Functions sub-option. That will give you the Change Multi-Variate Functions window, below.		Begin at the Main Menu of IFs. Choose the Change Selected Functions option under Scenario Analysis. Then choose the Multivariate Functions sub-option. That will give you the Change Multi-Variate Functions window, below.

	[[File:Useifs41.PNG\|~~center~~]]		[[File:Useifs41.PNG\|frame\|right\|Change Multi-Variate Functions window]]

	Our creation of the functions was most often to use in computations of the model run from the base year, sometimes to be used in the historical run, and sometimes in the model's data preprocessor to fill holes and clean up data (again, for either historical forecasts or those looking forward). The options in the upper right are all checked by default, but if you wanted to see only those functions used in the model run, you could turn off all of the other checks. This form actually gives you the opportunity to revise the functions used in the model run.		Our creation of the functions was most often to use in computations of the model run from the base year, sometimes to be used in the historical run, and sometimes in the model's data preprocessor to fill holes and clean up data (again, for either historical forecasts or those looking forward). The options in the upper right are all checked by default, but if you wanted to see only those functions used in the model run, you could turn off all of the other checks. This form actually gives you the opportunity to revise the functions used in the model run.
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	The Run option can be found by selecting Scenario Analysis from the Main Menu.		The Run option can be found by selecting Scenario Analysis from the Main Menu.

	Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [[#Quick_Scenario_Analysis_with_Tree_Overview\|Quick Scenario Analysis with Tree]]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.		Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [[#Quick_Scenario_Analysis_with_Tree_Overview\|Quick Scenario Analysis with Tree]]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.[[File:Useifs42.PNG\|frame\|right\|Running Working Scenario Window]]

	Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [[#Exploring_and_Changing_Parameters_2\|Run]] option from that form. It will also take them to this form for Running (the) Working Scenario.		Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [[#Exploring_and_Changing_Parameters_2\|Run]] option from that form. It will also take them to this form for Running (the) Working Scenario.

	On this form you can specify for how many years IFs should run. Choose the year in which you would like the run to stop and then click Start Run.		On this form you can specify for how many years IFs should run. Choose the year in which you would like the run to stop and then click Start Run.

	~~[[File:Useifs42.PNG\|center\|Useifs42.PNG]]~~

	= <span style="font-size:xx-large;">Reload the Base</span> =		= <span style="font-size:xx-large;">Reload the Base</span> =

	When you have used the scenario tree (see Quick Analysis with Scenario Tree) to build a scenario via parameter changes or to load a pre-existing set of parameter changes (an .sce file) and then run the scenario to generate a run or results file, the Working File will hold the contents of that model run. It will therefore be different from the Base Case, to which it is automatically set every time you start IFs again. Should you wish to reset the Working File to the Base Case in a session of work with IFs, simply use the Reload the Base sub-option under the Scenario Analysis option of the Main Menu.		When you have used the scenario tree (see Quick Analysis with Scenario Tree) to build a scenario via parameter changes or to load a pre-existing set of parameter changes (an .sce file) and then run the scenario to generate a run or results file, the Working File will hold the contents of that model run. It will therefore be different from the Base Case, to which it is automatically set every time you start IFs again. Should you wish to reset the Working File to the Base Case in a session of work with IFs, simply use the Reload the Base sub-option under the Scenario Analysis option of the Main Menu.

CamrynDreyer at 14:39, 21 July 2017

2017-07-21T14:39:09Z

← Older revision		Revision as of 14:39, 21 July 2017
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	The Run option can be found by selecting Scenario Analysis from the Main Menu.		The Run option can be found by selecting Scenario Analysis from the Main Menu.

	Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [[#~~Quick Scenario Analysis with Tree Overview~~\|Quick Scenario Analysis with Tree]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.		Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [[#Quick_Scenario_Analysis_with_Tree_Overview\|Quick Scenario Analysis with Tree]]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.

	Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [[#Exploring_and_Changing_Parameters_2\|Run]] option from that form. It will also take them to this form for Running (the) Working Scenario.		Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [[#Exploring_and_Changing_Parameters_2\|Run]] option from that form. It will also take them to this form for Running (the) Working Scenario.

CamrynDreyer at 14:38, 21 July 2017

2017-07-21T14:38:24Z

← Older revision		Revision as of 14:38, 21 July 2017
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	The Run option can be found by selecting Scenario Analysis from the Main Menu.		The Run option can be found by selecting Scenario Analysis from the Main Menu.

	Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [~~http://www.du.edu/ifs/help/use-online/scenario/quick/overview.html~~ Quick Scenario Analysis with Tree]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.		Use this IFs option if you would like to take a Working File to which you have made scenario changes (see the topic on [[#Quick Scenario Analysis with Tree Overview\|Quick Scenario Analysis with Tree]) and run it so that all of the variables of IFs are recomputed. It is important to remember that scenario changes of parameters or initial conditions by themselves do not affect the forecasted variables of IFs. It requires a run of the model to do those computations. When the run is completed after parameter changes, the forecast variables of the Working File will have been completely changed.

	Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [~~http://www.du.edu/ifs/help/use-online/scenario/quick/exploring.html~~ Run] option from that form. It will also take them to this form for Running (the) Working Scenario.		Entering this form directly from the Main Menu is actually not the most common path. Typically, users will change parameters in the Quick Scenario Tree and use the [[#Exploring_and_Changing_Parameters_2\|Run]] option from that form. It will also take them to this form for Running (the) Working Scenario.

	On this form you can specify for how many years IFs should run. Choose the year in which you would like the run to stop and then click Start Run.		On this form you can specify for how many years IFs should run. Choose the year in which you would like the run to stop and then click Start Run.

	[[File:Useifs42.PNG\|center]]		[[File:Useifs42.PNG\|center\|Useifs42.PNG]]

	= <span style="font-size:xx-large;">Reload the Base</span> =		= <span style="font-size:xx-large;">Reload the Base</span> =

	When you have used the scenario tree (see Quick Analysis with Scenario Tree) to build a scenario via parameter changes or to load a pre-existing set of parameter changes (an .sce file) and then run the scenario to generate a run or results file, the Working File will hold the contents of that model run. It will therefore be different from the Base Case, to which it is automatically set every time you start IFs again. Should you wish to reset the Working File to the Base Case in a session of work with IFs, simply use the Reload the Base sub-option under the Scenario Analysis option of the Main Menu.		When you have used the scenario tree (see Quick Analysis with Scenario Tree) to build a scenario via parameter changes or to load a pre-existing set of parameter changes (an .sce file) and then run the scenario to generate a run or results file, the Working File will hold the contents of that model run. It will therefore be different from the Base Case, to which it is automatically set every time you start IFs again. Should you wish to reset the Working File to the Base Case in a session of work with IFs, simply use the Reload the Base sub-option under the Scenario Analysis option of the Main Menu.

CamrynDreyer at 14:34, 21 July 2017

2017-07-21T14:34:46Z

← Older revision		Revision as of 14:34, 21 July 2017
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	== <span style="font-size:x-large;">Customization of Parameters</span> ==		== <span style="font-size:x-large;">Customization of Parameters</span> ==

	The [[#Exploring_and_Changing_Parameters_2\|Exploring and Changing Parameters Topic]] explains the general use of the [[#Quick_Scenario_Analysis_with_Tree_Overview\|Scenario ~~Treeto~~]] identify and begin to change parameters. The Fully Customize option calls up a specialized form that allows greater control over changes than the High/Low/Base radio buttons or the slider bar on the scenario tree form itself.		The [[#Exploring_and_Changing_Parameters_2\|Exploring and Changing Parameters Topic]] explains the general use of the [[#Quick_Scenario_Analysis_with_Tree_Overview\|Scenario Tree]] to identify and begin to change parameters. The Fully Customize option calls up a specialized form that allows greater control over changes than the High/Low/Base radio buttons or the slider bar on the scenario tree form itself.

	Alternative Ways to Use the Change Values Form:		Alternative Ways to Use the Change Values Form:

CamrynDreyer at 14:34, 21 July 2017

2017-07-21T14:34:23Z

← Older revision		Revision as of 14:34, 21 July 2017
Line 147:		Line 147:
	== <span style="font-size:x-large;">Customization of Parameters</span> ==		== <span style="font-size:x-large;">Customization of Parameters</span> ==

	The [[#~~Exploring and Changing Parameters~~\|Exploring and Changing Parameters Topic]] explains the general use of the [[#~~Quick Scenario Analysis with Tree Overview~~\|Scenario ~~Tree~~]]to identify and begin to change parameters. The Fully Customize option calls up a specialized form that allows greater control over changes than the High/Low/Base radio buttons or the slider bar on the scenario tree form itself.		The [[#Exploring_and_Changing_Parameters_2\|Exploring and Changing Parameters Topic]] explains the general use of the [[#Quick_Scenario_Analysis_with_Tree_Overview\|Scenario Treeto]] identify and begin to change parameters. The Fully Customize option calls up a specialized form that allows greater control over changes than the High/Low/Base radio buttons or the slider bar on the scenario tree form itself.

	Alternative Ways to Use the Change Values Form:		Alternative Ways to Use the Change Values Form: