how much time does it take to run a coxph how long does it take for exact to be run what is the exact method for ties in a cox model used for why should we use exact method for ties in cox models which method do you use for ties why use the exact method on cox model for ties how long does it take to run a cox data analysis? how important is ties analysis how long to run ties analysis what is the exact method how to find ties on a cox model how do i check ties in cox model what is the exact method of a cox model how long does it take to find ties which cox method best describes ties? why is the exact method important in coxph cox ties how long is this analysis how long does it take for an exact cox model to perform how do you find ties in a cox model why use exact method in cox?