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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