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In one of my questions:

How to measure test set error with logistic regression

One of the answers mentioned "concordance probability" or c-index. Unfortunately I'm not familiar with the term and there seems to be no Wikipedia page and Google turns up nothing. It's my understanding that it relates to classification.

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Mike Flynn
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    You can search this site for c-index and likely find links to what you need. – D L Dahly Dec 14 '13 at 20:28
  • @DLDahly is correct: you can find many answers by searching [c-index concordance](http://stats.stackexchange.com/search?q=c-index+concordance), for instance. – whuber Dec 14 '13 at 21:30

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