sub analysis in Survival Analysis

[Sateesh Shankaranarayana]

Dear Statalist members,

I am doing survival analysis (time to event). In my analysis there are treatment group has received one of the 10 different medications and control group has no medications. I am keen to check survival analysis for 2 of the specific medications. When I stset the data with (for example, stset time if trt==drugA) my control group is discarded. Is there any way to overcome this. I want to keep all of the control group and with the treatment group , keep only subjects receiving either drug A or drug B).

I very much appreciate advice.

With warm regards,
Sateesh

[Øyvind Snilsberg]

something like,

stset time if trt=="drugA" | trt=="drugB" | trt=="no medications"

where trt=="no medications" identifies the control group

[Sateesh Shankaranarayana]

Thanks very much