Hello everyone

Perform a COX proportional hazard regression model. However, the final multivariate model violates the risk proportionality assumption by all methods (stphtest, tvc () texp (ln (_t))), residuals, etc.

Later I evaluate the model, concluding that it is nested, and I decided to use a Weibull model.



My question to you once you have used a parametric model and violated the proportional hazards assumption, it is okay to go ahead and use a Weibull type model, and what does it imply?