topic Re: Inclusion automatic possible interaction for variable selection using proc logistic in Statistical Procedures

Inclusion automatic possible interaction for variable selection using proc logistic

Lijuu — Wed, 16 May 2018 09:28:27 GMT

Dear All

How can i include automatically all possible interaction of main effects to make variable selection?

here the code
proc logistic data=main;
model y/n= a b c d e /selection=stepwise slentry=0.10 slstay=0.150 details lackfit;
run;

desired consideration:

proc logistic data=main;
model y/n= a b c d e a*b a*c a*d a*e b*c b*d b*e c*d c*e d*e /selection=stepwise slentry=0.10 slstay=0.150 details lackfit;
run;

Thank you much.

Re: Inclusion automatic possible interaction for variable selection using proc logistic

SAS_Rob — Wed, 16 May 2018 12:17:22 GMT

you can use the | notation with the @ to specify the degree. For all two way interactions it would be:

model y/n= a|b|c|d|e @2 /selection=stepwise slentry=0.10 slstay=0.150 details lackfit;

Re: Inclusion automatic possible interaction for variable selection using proc logistic

Ksharp — Wed, 16 May 2018 12:18:42 GMT

proc logistic data=sashelp.class;
model sex=age|weight|height @2 ;
run;

Re: Inclusion automatic possible interaction for variable selection using proc logistic

Lijuu — Sat, 26 May 2018 09:25:14 GMT

Dear Ksharp:
Thank you much!

Re: Inclusion automatic possible interaction for variable selection using proc logistic

Lijuu — Sat, 26 May 2018 09:26:29 GMT

Dear:
Thank you!