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Re: st: C-index for ordered logit models
At 11:31 30/11/03 +0100, Pierre Antoine Kremp wrote:
Somers' D is linked to the C-index by the formula
Does anybody know how to get the c-index (or simply the percentage of
concordant/tied/discordant pairs) after an ordered logit model? I know
that Sas gives this statistic in every logit regression output, but I
can't get it when I use Stata. Is there a specific instruction?
and can be computed, with confidence limits, by my -somersd- package
(downloadable from SSC together with .pdf manuals). More can be found on
Somers' D, Kendall's tau-a and median differences in my Stata Journal
article (Newson, 2002), which can be downloaded as a pre-publication draft
from my website at
either using a browser or using the Stata -net- command.
I hope this helps.
Newson R. Parameters behind "nonparametric" statistics: Kendall's tau,
Somers' D and median differences. The Stata Journal 2002; 2(1): 45-64.
Lecturer in Medical Statistics
Department of Public Health Sciences
King's College London
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