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Ubai
Quartz | Level 8

Hi everyone,

 

I'm investigating survival in a cancer patients cohort. The Cox model I'm using is stratified by stage and adjusted for several variables. I would like to add one variable RT (Radiotherapy) which is of particular importance in higher stages.

 

How should I modify my Cox model so that it include this variable only for certain stage strata? I am using SAS, but I would like to learn the concept rather than the application code.

 

Thanks in forward.

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