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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.
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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
