= Goodman and Kruskal's gamma
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{title2=$\gamma=(C-D)/(C+D)$}
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= Goodman-Kruskal gamma
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For $C$ <concordant pairs> and $D$ <discordant pairs>, <Goodman and Kruskal's gamma> compares their difference with their total. It ranges from $-1$ to $1$ when $C+D>0$ and discards all pairs tied in either variable. Reversing exactly one category ordering reverses its sign; reversing both leaves it unchanged. Zero gamma does not imply <independence>, and ignoring numerous ties can make its magnitude larger than a tie-adjusted measure.https://andrisignorell.github.io/DescTools/reference/GoodmanKruskalGamma.html[DescTools documentation, Details: concordances, discordances and discarded ties]{ref}
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