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<math>WATWASTE_{r,t}=\frac{SANITATION(improved)_{r,t}}{1+e^{-(-2.4+0.043*GDPPCP_{r,t}+0.042*\frac{POPURBAN_{r,t}}{POP_{r,t}})}
<math>WATWASTE_{r,t}=\frac{SANITATION(improved)_{r,t}}{1+e^{-(-2.4+0.043*GDPPCP_{r,t}+0.042*\frac{POPURBAN_{r,t}}{POP_{r,t}})}