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The '''Renkonen similarity index''' (P), is a measure of dissimilarity between two [[community (ecology)|communities]] (sites), based on relative (proportional) [[abundance (ecology)|abundances]] <math> p_i = n_i/\sum{n_i}</math> of individuals of composite [[species]]. It was developed by the botanist [[Olavi Renkonen]] and published in 1938.<ref>Renkonen, O. 1938. Statisch-ökologische Untersuchungen über die terrestrische Käferwelt der finnischen Bruchmoore.  Ann. Zool. Soc. Bot. Fenn. Vanamo 6:1-231</ref>

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

==See also==
*[[Index of dissimilarity]]

== References ==
{{Reflist}}

{{biology-stub}}

[[Category:Biodiversity]]
[[Category:Index numbers]]

[[ru:Коэффициент сходства]]