Recreate the model frame of a coxph fit.
# S3 method for coxph
model.frame(formula, ...)the result of a coxph fit
other arguments to model.frame
the model frame used in the original fit, or a parallel one for new data.
For details, see the manual page for the generic function.
This function would rarely be called by a user, it is mostly used
inside functions like residual that need to recreate the data
set from a model in order to do further calculations.