It is a hybrid spatial model that combines the variable selection capabilities of stepwise regression methods with the predictive power of the Geographically
Weighted Regression(GWR) model.The developed hybrid model follows a two-step approach where the stepwise variable selection method is applied first to identify
the subset of predictors that have the most significant impact on the response variable, and then a GWR model is fitted using those selected variables for spatial
prediction at test or unknown locations. For method details,see Leung, Y., Mei, C. L. and Zhang, W. X. (2000).