07-29-2015 10:16 PM
This is my first time posting on SAS Support Communities, so please correct me if I'm not using the correct format for my question.
So here is my problem. I have 5 main continuous effects (Y A B C D) and 1 class effect (3 levels) M. I would like to do a regression with interactions in a form of:
Y= A B C D M AM BM CM DM
Could you please help me how to code this on sas.
07-30-2015 09:37 AM
In a procedure such as PROC GLM you can say
model Y= A B C D M A*M B*M C*M D*M;
You can look at the GLM documentation for a full description of how to specify interactions in SAS regression procedures that support this syntax. The section also includes notational "shortcuts" and how to specify common models.
07-30-2015 07:52 PM
Thank you very much for your prompt response. I was able to make the code with Proc GLM in my previous question. My next problem is I'm having 2 groups of variables: 10 continuous variables X1 x2 .. X10 (and maybe more) and 7 class variables C1 C2 ..C7. Is there any short cut way of coding the interactions between continuous variables and class variables, but excluding interactions within their groups:
X1..X10 X1C1 X1C2.. X1C7 X2C1..X2C7 ...X10C1..X10C7 C1..C7
I tried (X1X2..X10)|(C1..C7) but the certainly it was not correct syntax.
07-31-2015 07:13 AM
I do not know how do that. People have written macros that generate models like that. You can try an internet search for terms like
sas macro regression model pairwise interactions