All Questions
6 questions
2
votes
2
answers
1k
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Which method of handling non-proportional hazards (here: crossed KM curves in 2+ points) would you prefer?
I have an experiment, where I compare two groups over time in frames of the time to event analysis.
The Kaplan-Meier curves cross 3 times.
It means, that the hazards ratios switch to the opposite side ...
1
vote
1
answer
436
views
Covariate and Interaction Not Significant When Both in the Model
I am looking at a survival model based on dosing variables, all of which are continuous. I have noticed when categorized, based on Kaplan Meier Curves, that low, medium, high doses behave differently, ...
- 79
6
votes
1
answer
12k
views
Interpreting interaction terms in Cox Proportional Hazard model
I am new to survival analysis, so forgive me if this questions is stupid - but I couldn't find the answer anywhere else. We are looking at readmission to a treatment program, which is defined as ...
5
votes
1
answer
25k
views
Interaction effects in Cox model (continuous, dichotomous, and categorical variables)
I get a couple of puzzling results in my (repeated event) cox model when I introduce interaction effects. I will here pose several questions about interaction effects (in survival analysis context) in ...
- 300
4
votes
1
answer
413
views
Testing the proportional hazards assumption with a time varying covariate
One of the cohort studies I have carried out recently involved examining the association between post-diagnostic beta-blocker use and breast cancer outcomes in a cohort of breast cancer patients. ...
- 41
2
votes
1
answer
3k
views
Violation of proportional hazard for covariate but not for interaction it's part of in a Cox Proportional Hazards model
I have a problem in which one of the covariates in my model violates the assumption of proportional hazards, but the interaction it is part of does not.
Data info:
Lifespan - mosquito time to death (...
