Table 1.

Similarity Measures, adapted from Cox and Cox (2000).

Czekanowski, Dice, Sorensen	$\frac{2a_{11}}{2a_{11}+a_{12}+a_{21}}$
Jaccard	$\frac{a_{11}}{a_{11}+a_{12}+a_{21}}$
Rogers, Tanimoto	$\frac{a_{11}+a_{22}}{a_{11}+2a_{12}+2a_{21}+a_{22}}$
Simple matching coefficient	$\frac{a_{11}+a_{22}}{a_{11}+a_{12}+a_{21}+a_{22}}$