Randomizes a binary matrix speciesData by reshuffling all elements. Rows are equiprobable, and columns are proportional to column sums. Makes a call to the vector_sample function.
binary presence-absence matrix (rows = species, columns = sites).
This algorithm assumes that species are equiprobable, but that differences in suitability among sites are proportional to observed species richness (=colsums).
Returns a binary presence-absence matrix with the same dimensions and fill as the input matrix.
This algorithm assumes that species are equiprobable, and that differences among sites are proportional to observed species richness (=colsums). sim6 has a high frequency of Type I errors with random matrices, so it is not recommended for co-occurrence analysis.
Gotelli, N.J. 2000. Null model analysis of species co-occurrence patterns. Ecology 81: 2606-2621.
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