On Feb 22, 2012, at 6:59 PM, niloo javan wrote:
hi
I have a problem with Median in Survival.
when I use
S1=survfit(Surv(Time,Status))
the result shows the median but I cannot use it as numeric!
S1$median in Null
That does not look like a formula.
Furthermore I do not think there is an element in a survfit.object
named 'median'. (It's certainly not documented on the help pages.)
Objects are passed to their print methods and the `print.survfit`
function passes off its data argument first to `survmean`, then to
`pfun`, then to `minmin` which does the job of calculating a median,
which print.survfit then prints (as a side-effect using `cat`), but
never stores in a returned object.
Is this is homework?
--
David Winsemius, MD
West Hartford, CT
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