## Quick Reference

In descriptive statistics, an index of association between two variables measured on ordinal scales. If two pairs of scores are examined, they must either be concordant, in the sense that the one ranked higher than the other on the first variable is also ranked higher than the other on the second variable, or discordant. Gamma is defined as the difference between the number of concordant pairs and the number of discordant pairs divided by the total number of concordant and discordant pairs, and it ranges from 0 to 1. Also called *Goodman-Kruskall gamma*, and closely related to Somers' *D* and to Kendall's tau. [From *gamma* (γ), the third letter of the Greek alphabet]

*Subjects:*
Psychology.

## Related content in Oxford Index

##### Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.