On Jun 27, 2011, at 4:31 PM, array chip wrote:
Hi, I am wondering if anyone can explain to me if cumulative
incidence (CI) is
just "1 minus kaplan-Meier survival"?
First tell us what you think CI is defined as. I suspect it is not the
same. The KM estimator is cumulative product of (alive-n(dead))/alive
so is the product of interval survival probabilities. I doubt that
your definition of CI has a similar denominator.
Under what circumstance, you should use
cumulative incidence vs KM survival? If the relationship is just CI =
1-survival, then what difference it makes to use one vs. the other?
And in R how I can draw a cumulative incidence plot.
plot(time, cumsum(dead)) ...?
I know I can make a
Kaplan-Meier survival plot using plot(survfit()), for example:
fit<-survfit(Surv(time,status)~group,data=data)
plot(fit, col=1:2)
How to draw CI plot then?
As above. Specify what you are seeking.
There is a well-defined relationship between S(t) and the cumulative
hazard. Maybe you should do a little study of those terms in texts
regarding survival analysis.
Thanks very much!
John
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Isn't it time you learned to post in plain text?
--
David Winsemius, MD
West Hartford, CT
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