| survfit {survival} | R Documentation |
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.
survfit(formula, ...)
formula |
either a formula or a previously fitted model |
... |
other arguments to the specific method |
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.
An object of class survfit containing one or more survival curves.
Older releases of the code also allowed the specification for
a single curve
to omit the right hand of the formula, i.e., ~ 1.
Handling this case required some non-standard and fairly fragile
manipulations, and this case is no longer supported.
Terry Therneau
survfit.formula,
survfit.coxph,
survfit.object, print.survfit,
plot.survfit, summary.survfit