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jdykstra
Calcite | Level 5

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;
1 REPLY 1
ballardw
Super User

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

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