validation of cox model in r how to validate cox ph how do i calibrate cox ph model r error when calibrating ph model what is the function of the validation function of cox ph what is the error code for r validation when to use the validation code for cox test what is a error when r is attempting to validate a cox model what is r validation code for cox model what is the error code for validation of a cox ph model in r? what is the error code for validation in r r code for time to event when r generates cox ph values the error message is r validate cph vs calibrate in the function validate cox model which r function do i use to validate a cox model? validation of cox model with time dependent covariates r error in validate r validation code which is an error when calculating the cox model