The square root of the sum of discordant cases, minimum value is 0, and it has no upper limit. The sum of discordant cases, minimum value is 0, and it has no upper limit. An index of asymmetry. It ranges from 0 to 1. Dissimilarity measure for binary data that ranges from 0 to 1.
Equal weight is given to matches and nonmatches.
This is an index in which joint absences are excluded from consideration, and matches are weighted double. Also known as the Czekanowski or Sorensen measure. This index is a function of the cross-ratio for a 2 x 2 table and is independent of the marginal totals. It has a range of -1 to 1. Also known as the coefficient of colligation.