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tina_ting
Fluorite | Level 6

Hello SAS experts,

 

I used the SAS code recommended in this link to perform an ITS analysis.

https://support.sas.com/kb/70/498.html

 

If I want to take the ITS code for a one-group, one-stage design with a binary response, and modify it to a  one-group, two-stage and two-group, two-stage design, how should I change it?

If I also want to include covariates (categorical variables), where in the syntax should I place those variables?

 

Thank you very much for your help!

 

/*one-group, one-stage, Binary Response*/
original month1-6
iv1=0/1 (at month3)
iv2=0/1 (at month5)
original month1= month1 original month2= month2 original month3= month3 original month4= month1 original month5= month2 original month6= month3 proc gee data=a; class id iv1; model y(event="1") = iv1 month iv1*month / dist=bin noint; repeated subject=id; run; proc gee data=a; class id iv1; model y(event="1") = iv1 iv1*month / dist=bin noint; repeated subject=id; effectplot fit(x=month plotby(pack)=iv1) / clm; effectplot fit(x=month plotby(pack)=iv1) / link clm; estimate 'm3 log odds' iv1 1 0 iv1*month 3 0 / ilink; estimate 'm4 log odds' iv1 0 1 iv1*month 0 1 / ilink; estimate 'm3 to m4 odds ratio' iv1 -1 1 iv1*month -3 1 / exp cl; store gee; run;

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