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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