topic Re: Regression in SAS Enterprise Guide

Regression

jdykstra — Tue, 24 Nov 2020 23:25:41 GMT

Hello,

I was just curious if there is a difference between a*b and a(b) in proc glm.

proc glm;
      class a b;
      model y=a b a*b;
run;

proc glm;
      class a b;
      model y=a b a(b);
run;

ballardw — Wed, 25 Nov 2020 00:07:29 GMT

a(b) is "a nested within b"

a*b is interaction

make some data, run the code, see the result. Make sure to use some variety in the a b values per record