Renkonen similarity index

The Renkonen similarity index (P), is a measure of dissimilarity between two communities (sites), based on relative (proportional) abundances $$ p_i = n_i/\sum{n_i}$$ of individuals of composite species. It was developed by the botanist Olavi Renkonen and published in 1938.

$$ P = \sum{min(p_1;p_2)}$$,

$$ p_1$$ - percentage structure of one set,

$$ p_2$$ - percentage structure of second set.

The codomain of this distance function ranges from 1 (identical proportional abundances) to 0 (no taxa shared).