Spatial Downscaling of TRMM Precipitation Data Using an Optimal Subset Regression Model with NDVI and Terrain Factors in the Yarlung Zangbo River Basin, China

Table 2

All possible optimal regression subsets.

Number of variables	Optimal subsets	Multiple correlation coefficient ()	RMSE (mm)	CSC results
1		0.75	154.81	266.68
2		0.83	144.59	284.81
3		0.88	138.06	290.07
4		0.89	134.83	293.33
5		0.89	133.74	294.62
6		0.89	133.93	293.84