FIGURE 7.
The correlation between measured and predicted values in estimating PWC in winter wheat using the sensitive bands with the first derivative transformation selected by SR in model validation. The dotted line represents the 1:1 line. B+VIP represents the joint analysis of regression coefficients and the variable importance in the projection of PLSR model. SR, SPA, RF, and UVE represent stepwise regression, successive projections algorithm, random frog, and uninformative variables elimination, respectively.