Relationship between observed versus predicted values of WNV vector prevalence under random forest models using the same data set for testing and training, and under models where ∼36% of the data was separated from training and used as test data (36).

Root mean square error (RMSE) percentage of observed prevalence range are reported for single models (parentheses), whereas out-of-bag (OOB) error rates were used in calculations of percent variation explained in the separate random forest models.