This function creates survival curves from either a formula (e.g. the
Kaplan-Meier), a previously fitted Cox model, or a previously fitted
accelerated failure time model.
Usage
survfit(formula, ...)
Arguments
formula
either a formula or a previously fitted model
...
other arguments to the specific method
Value
An object of class survfit containing one or more survival curves.
Details
A survival curve is based on a tabulation of the number at risk and
number of events at each unique death time. When time is a floating
point number the definition of "unique" is subject to interpretation.
The code uses factor() to define the set.
For further details see the documentation for the appropriate method, i.e.,
?survfit.formula or ?survfit.coxph.