S+ function survmean

To:	s-news@lists.biostat.wustl.edu
Subject:	S+ function survmean
From:	"Data Analytics Corp." <dataanalytics@earthlink.net>
Date:	Sun, 18 Nov 2007 17:23:52 -0500
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Hi,

I ran a simple survival analysis in S+8.0 using

       p <- survfit(Surv(tenure, expired), data = x)

and returned the object p.  When I look at p, I see

       Call: survfit(formula = Surv(tenure, expired), data = x)

        n.obs n.max n.first events mean se(mean) median 0.95LCL 0.95UCL
        23163 23163   23163   3497 44.2     0.45     NA      NA      NA

First, I'm puzzled by the NAs. But my first question is what is themedian that this returns? Is it the median length of time till death?When I use survmean(p), I get these numbers, but survmean isundocumented as far as I can tell. Any ideas?


Thanks,

Walt Paczkowski

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