. . . I'm attempting to understand how R's coxph() accepts and handles repeated entries for subjects (or patient/customer if you prefer). . . . As an example in R, I use the data from John Fox' appendix on the Cox-PH model which provides a very nice introductory text. Using the reference="strata" option is the safest centering, since strata occassionally have different means. If the proportional hazards assumption holds then the true beta(t) function would be a horizontal line. 2. This function would usually be followed by both a plot and a print of the result. These type of plot is called a forest plot. The number of degrees of freedom (df) used by the fit and the effective number of observations (nobs) are added as attributes. . Previously, we described the basic methods for analyzing survival data, as well as, the Cox proportional hazards methods to deal with the situation where several factors impact on the survival process.. data: a dataset used to fit survival curves. The same as in residuals.coxph: character string indicating the type of … The formula argument is a little di erent. See for example the data set that includes the ID column in the Answers section at: Extracting non-zero coefficients in glmnet in R. 1. Hot Network Questions Pass a variable to Javascript directly from