[R] glmer with non integer weights

[Kay Cichini]

hello,

it's the Morisita Horn Index, which is an ecological index for similarity
between two multivariate objects (vegetation samples with species and its
abundance) where a value of one indicates completely same relative
importance of species in both samples and 0 denotes total absence of any
same species.

it can be expressed as a probability:

(prob. that an individual drawn from sample j 
and one from sample k belong to the same species)
-------------------------------------------------   = MH-INdex
(prob. that two ind. drawn from either sample will 
belong to same species)

it is also covered in
library(vegan);?vegdist
here it is its complement: 1-MH, which then is a dissimilarity measure

best regards,
kay

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