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Show number at risk on Kaplan Meier curve

Mark Wardle 
Dear all,

I'm using the "survival" package with R 2.4.0 on Mac OS X 10.4.8.

I have two core statistics books (one of which is Altman's medical stats
book) which suggest showing the number of individuals at risk at
different time intervals on the Kaplan-Meier curve.

My plot shows two curves that later cross, because of one significant
outlier.

I have two queries:

Is there an easy way of displaying number of individuals at risk at a
specific time interval?

Is there a way to stop plotting when the number of individuals at risk
reaches a certain minimum threshold to reduce the risk of such an
outlier problem?

If there is no easy solution, then I suppose I shall have to perform the
logic myself, calculating when individuals "drop out", and overlaying
that onto the plot?

Many thanks,

Mark

Thread (4 messages)

Mark Wardle Show number at risk on Kaplan Meier curve Dec 9 Charles C. Berry Show number at risk on Kaplan Meier curve Dec 9 Frank E Harrell Jr Show number at risk on Kaplan Meier curve Dec 10 Mark Wardle Show number at risk on Kaplan Meier curve Dec 10