hi ptrblck
thanks for reply …first condition is for case when break points are say 3,7 …so first group has to be 0 to 3 ,secomd 3 to 7 and last 7 till end .so if i pass 0 ,7 ,then groups wld be 0 to 7 and 7 till end …
here m not sure if m grouping param correctly as my model performs worse with these grouping compared to having one default group of all params.