checking the validity of the regression model

[christianbriese]

@mattia6690 , @basu26, @aljacob

SRR3, RID-30:
An essential step for checking the validity of the regression model and the training data, is to simply plot the predicted versus the observed FCC value. Ideally this plot would be created overal and for different subregions.

Answer: MR: Agreed, we will add a model performance evaluation until the LPS

Completed?