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 -0.341357727 -0.002645013
-0.338712715 40
R2 0.084694141 0.095440176 0.079077594 0.016362582
0.068331560 40
Slope 1.000000000 1.000000000 0.897999711 0.102000289
0.897999711 40
D 0.033368588 0.038458457 0.030983429 0.007475027
0.025893561 40
U -0.002890981 -0.002968495 0.003412045 -0.006380539
0.003489558 40
Q 0.036259569 0.041426951 0.027571385 0.013855566
0.022404003 40
Many thanks
Dr MAZOUNI
Institut Gustave Roussy
Department of breast surgical oncology
Villejuif, France
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