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01-11-2017 01:51 PM

Dear all,

I have this logistic regression model and would like to extract the p value of the interaction term "drug*var1".

**proc** **glm** data=test;

model bodyweight = drug var1 drug*var1;

**run**;

Problem is I need to do this 600 times because there are var1, var2, var3..... .... var600. Any thoughts appreciated!!

Raymond

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Posted in reply to rykwong

01-11-2017 04:10 PM

Hi,

the idea is as follows

with

ODS listing off;

you can stop procedure list output

with

ODS output....;

you can direct procedure results (in your case the p values) to datasets, please check exact syntax...

finally you macro loop around the Proc glm

%macro writep;

%do k=1 %to 600;

ods output ...out=pdset&k;

proc glm;

model bodyw = drug var&k drug * var&k;

run;

%end;

proc append base=pvalues data=pdset&k; run;

%mend;

%writep;

hope it helps...

sincerly Karl

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Posted in reply to Karlb

02-13-2017 09:19 AM

Although Karlb's solution will work, it tends to be slow. An alternative solution is to transform the data from wide form to long form. The new form of the data will contain 600 BY groups. The first contains the data for Y, Drug, and X1. The second contains the data for Y, Drug, and X2. And so on. For an example and discussion, see the article