cox.zph(fit, transform = "km", global = TRUE, ...)
Arguments
fit
the result of fitting a Cox regression model, using the coxph function.
transform
a character string specifying how the survival times should be transformed
before the test is performed.
Possible values are "km", "rank", "identity" or a
function of one argument.
global
should a global chi-square test be done, in addition to the
per-variable tests.
...
Additional arguments to cox.zph, for example index if
fit is a GammaStatList object