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chafiki
2011 Aug 19
1
help Dxy and C-index calculation
Dear professor,
I am currently using Design package and the cph formula for assessing
multivariable analysis.
I am tryng to get the C-index for my survival model based on Dxy
coefficient.
I am confused since there is a negative value.
Do I need to used the absolute Dxy ?
index.orig training test optimism index.corrected n
Dxy -0.341357727 -0.344002740