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blackscorpio
2013 Jan 24
4
Difference between R and SAS in Corcordance index in ordinal logistic regression
...Concordant Uncertain
32.00000000 722.00000000 699.00000000 0.00000000
I.e., C=.968 instead of .963. But this is even farther away than the value
from SAS you reported.
If you don't believe the rcorr.cens result, create a tiny example and do the
calculations by hand.
Frank
blackscorpio81 wrote
> Dear R users,
>
> Please allow to me ask for your help.
> I am currently using Frank Harrell Jr package "rms" to model ordinal
> logistic regression with proportional odds. In order to assess model
> predictive ability, C concordance index is displayed and equa...