Fitting 'by groups'
I have grouped data and I'd like to fit a model to each group's data. To do this in SAS, I use a BY <grouping var> statement and in SPSS it's a split file statement. Is there a way to do this in RapidMiner? As I'm doing it now, I'm writing out each subgroups data which is extremely slow and difficult to maintain.
Thanks for your help,