Unbox the Cox: A Hidden Dark Secret of Cox Regression

Why do perfect predictors result in a p-value of 0.93?

Diving into the perfect predictors

If you have been following my previous blog posts, you might recall that logistic regression encounters a problem when trying to fit perfectly separated data, leading to an infinite odds ratio. In Cox regression, where hazard replaces odds, you might wonder if a similar issue arises with perfect predictors. It does occur, but unlike logistic regression, it is …

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