Lifetime data with bathtub-shaped hazard rate function are often encountered in survival analysis and the classical lifetime distributions mostly used cannot adequately describe the data. Is there any parametric survival model suitable for modelling such type of data?
If the proportional hazards assumption is violated then you can’t really use a cox model. One alternative is the restricted mean survival time (RMST)
https://cran.r-project.org/web/packages/survRM2/vignettes/survRM2-vignette3-2.html
I would suggest you google event study methods and add the functions you are interested in..these methods are sometimes considered there. Best wishes, David Booth
Please read the following post on stackexchange and the article below it :
https://stats.stackexchange.com/questions/399544/in-survival-analysis-when-should-we-use-fully-parametric-models-over-semi-param
Article Parametric regression model for survival data: Weibull regre...
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