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2005 Sep 02
1
C-index : typical values
...eone tell me where I am going wrong please ? Here is an example using the German Breast Study Group data available in the mfp package. The predictors in the model were selected by stepAIC(). library(Design); library(Hmisc); library(mfp); data(GBSG) fit <- cph( Surv( rfst, cens ) ~ htreat + tumsize + tumgrad + posnodal + prm, data=GBSG, x=T, y=T ) val <- validate.cph( fit, dxy=T, B=200 ) round(val, 3) index.orig training test optimism index.corrected n Dxy -0.377 -0.383 -0.370 -0.013 -0.364 200 R2 0.140...