Hello
I am trying to test multiplicative interaction between 2 categorical variables with more than 2 categories.
Would it be appropriate to use this code?
proc phreg data=new;
class diet_scorecategory (ref="1");
model (time*outcome(0) = bmicategory diet_scorecategory interactionterm;
interactionterm=bmicategory*diet_scorecategory;
run;
I would appreciate the help!
Thank you