All Questions
4 questions
1
vote
1
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315
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In SAS what is the difference of including treatment variable in model and using the strata statement for treatment variable?
Im building a Cox Regression in SAS. My code looks like this:
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0
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1
answer
416
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When having non-proportional hazards, should I use stratified Cox by time or Logrank tests within periods?
My data have non-proportional hazards with clear separation. Should I handle it via stratified Cox regression or using separate Log-rank test within subsets?
I will use R only to illustrate.
I want to ...
- 23
2
votes
1
answer
224
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When computing period-specific hazard ratio using Cox, should I add variable:strata or full variable * strata?
Let's asusme I want to calculate separate hazards ratio in two periods, split like below.
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0
votes
1
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73
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Cox model with a predictor variable within only one stratum
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 ...
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