[R] Question about survival::survfit

[Evan Kransdorf]

I am wanting to do a KM curve of two groups using survival. For some
reason, the summary(survfit) gives me the following output:



           records n.max n.start events median 0.95LCL 0.95UCL

VAR=N   10931 10931   10931   1646     NA      NA      NA

VAR=Y    3452  3452    3452    906     NA      NA      NA



I am not sure why it won’t give me median survival for each group?  There
are no NA in my data.



Thanks very much

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