In my original dataset, the response variable (RESIDUALS) can be less than zero.  However, all the predictions (P_RESIDUALS in data_out) are non-negative.  Where is the setting to allow negative predictions?   proc hpsplit data=data_in nodes;  class DIM1 DIM2;  model RESIDUALS = DIM1 DIM2;  grow RSS;  prune REDUCEDERROR(leaves=8);  output out=data_out;  id _Leaf_ DIM1 DIM2; run;quit;   ... View more