[R] survfit function - event information??

Terry Therneau
Tue, 22 Jun 2010 12:58:47 -0000

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I am trying to extract output information from the survfit function in
order
to generate a matrix of select output for multiple factors.
Specifically, I am interested in extracting the number of events (in the
output below: 106, 2, 3).  The variable names represented in my function
(ee) are shown below, but none of those variables correspond to the
column
of events as shown in the output.

-----------------------------

The easiest is to use the summary function:
   fit <- survfit(Surv(time, status) ~ ph.ecog, data=lung)
   temp <- summmary(fit)
   temp$table

          records n.max n.start events median 0.95LCL 0.95UCL
ph.ecog=0      63    63      63     37    394     348     574
ph.ecog=1     113   113     113     82    306     268     429
ph.ecog=2      50    50      50     44    199     156     288
ph.ecog=3       1     1       1      1    118      NA      NA

The table component is a matrix.

Terry Therneau