model assumptions

  1. R

    How to deal with non-proportional hazard Cox models?

    Dear all, I want to run a Cox model to see if there is an interaction between two treatments. However, the test to see if proportional hazard is respected suggests that it is actually not respected. So I don't know what other statistical survival analysis to do because it means I cannot rely on...
  2. D

    Mixed effects model residual analysis (help!)

    Hello, I have little experience with mixed-effects models and could do with some help when it comes to checking model assumptions. I am using the 'lme()' function from the 'nlme' library in R to test the fixed effects of a repeated measures design. Given a pair of sounds (A and B), each...