[R] compare c-index of two logistic models using rcorrp.senc() of the Hmisc library

From: Osman Al-Radi <osman_alradi_at_yahoo.ca>
Date: Sat 27 Aug 2005 - 03:16:20 EST

Dear R-help,

Would it be appropriate to do the following to calculate a p-value for the difference between c-ind of x1 and c-inx of x2 using the output from rcorrp.senc()

> r<-rcorrp.senc(x1,x1,y)

> pValue<-1-pnorm((r[11]-r[12])/(r[2]/r[5])*1.96)

Osman O. Al-Radi, MD, MSc, FRCSC
Chief Resident, Cardiac Surgery
University of Toronto, Canada

R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Aug 27 03:25:16 2005

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