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Cox Regression model with time-dependent covariates - violated assumption of proportional hazards (PH)

I am currently performing some Cox regression models. The image attached shows a Schönfeld residual based on one of the cox models with a significant p-value which means that the proportional hazards ...
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2 votes
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independence assumption on events in Cox model

In the wikipedia article on the Cox model, in the development of the partial likelihood, it is mentioned that the different subjects are treated "as if they were statistically independent." Is this in ...
Hasse1987's user avatar
  • 576
2 votes
2 answers
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how to deal with dependence/interaction among covariates in a cox regression model

In case of a linear regression, if we are to account for interaction between two regressors x1 and x2, we write a model like ...
rk567's user avatar
  • 711