Overview

China's sub-regional model has a total of 63 preprocessor series. Although there are 652 preprocessor series in the IFs model, there are many that are not applicable to sub-regional models or do not significantly impact forecasts; only 355 preprocessor series are sought for sub-regionalization. Thus China's sub-regional model has nearly 18% coverage at this point. There are a 29 preprocessor series that have been identified that could be pulled into the model. If this data was to be pulled the the total coverage of the model would increase to nearly 26%.

Below is a table that shows the module coverage for the China sub-regional model. Population has the most coverage, but this is also the fewest number of preprocessor series. The economy module has the second highest coverage, which is good. Population and Economy have the greatest impact on the model's overall behavior and coverage in these modules is important. Health and education are areas of weakness for the China sub-regional model. In part the weakness is driven by the large number of series in those modules. There is more education data available that could be brought into the model, but some of the data requires historical age-sex cohorts to calculate rates with the data. Health has low coverage because there is not a lot of health data that is available for free and in English. It appears that much of China's health data is proprietary and not publicly available, but there may be alternative sources available if a researcher searched in Mandarin.

IFs Module	Preprocessor Series Pulled	Total Preprocessor Series	Module Coverage
Population	7	8	87.5%
Economy	24	55	43.6%
Health	5	57	8.8%
Education	8	91	8.8%
Agriculture	11	36	30.6%
Energy	7	66	10.6%
Infrastructure	1	21	4.8%
Environment	0	9	0.0%
Socio-Political	0	12	0.0%
Total	63	355	17.7%
Potential Series	92	355	25.9%

Population

The provincial model's population for China was rolled up in IFs and compared to other population forecasts for China, as shown below. It is clear that the population forecast from the sum of the provinces (IFs_WB) is in line with other forecasting models. Nanjing University's forecasting model is the most off from the rest of the forecasts, where population growth is forecast to continue to rise.

It was difficult to find provincial forecasts on China, but there was one paper that was found in Mandarin that had provincial population forecasts for China's provinces. The paper from Nanjing University compared its forecasts to several other population forecasting models of China and this data was used to compare the IFs provincial model to. As was previously stated, Nanjing University's model has a steeper slope and forecasts population to continue to rise at the same rate, which all other forecasting models do not. This suggests that it might not be as good of a model as the others, but it gives some information about our forecasts.

Anhui

Both model's historical data looks strange for Anhui, this is seen throughout the provinces and is in part due to the changing definitions of boundaries throughout China. However, the shifts do not coincide perfectly, it looks like Nanjing University's data is lagged. Because the paper is in Mandarin there is not any certainty that this is true.

Beijing

Beijing has a large jump in the late 2000s in the World Bank data. Nanjing University's data decreases when the World Bank data is increasing in the late 2000s, which looks odd and perhaps is another sign that the data is lagged.