Regressing rice production onto population and precipitation gives estimates that result in Equation 17. Population and precipitation account for 76.08% of the variability of maize production. This proportion represents about 19.57% more than the variability explained by population alone (56.51%), and 13.48% more than the variability explained by precipitation alone (62.60%). The estimate of population (1) is statistically significant with a p-value of 0.002385, while the p-value for precipitation (2) is 0.000524. The model predicting rice production onto population and precipitation is statistically significant with a p-value of 4.853 x 10-7. The RMSE is 1.405421 x 10-12.