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Percent Concordance

The percent concordance is the percentage that a model’s outcome will be true, based on the observed outcomes from within the dataset. The concordance is calculated by pairing all records in the modeling dataset based on the actual outcome and determining how often the model was accurate in scoring those records.  For example, if you were predicting customer churn, the concordance value would be the percentage of the time that those that churned had a higher probability of churn than those that did not.

Customers that Churned Customers that Retained
CustomerID Probability CustomerID Probability Concordant
1 75% 2 83% No
1 75% 3 41% Yes
1 75% 4 32% Yes
1 75% 5 28% Yes
1 75% 6 15% Yes
Concordance Rate 80%



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