Description Usage Arguments Details Value Note References Examples
Randomizes a binary matrix speciesData by reshuffling elements within each column. Sampling weights for each row are proportional to row sums. Makes a call to the vector_sample function.
1 | sim5(speciesData)
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speciesData |
binary presence-absence matrix (rows = species, columns = sites). |
This algorithm preserves differences among sites in species richness, but assumes differences among species in commonness and rarity are proportional to observed species occurrences (= row sums).
Returns a binary presence-absence matrix with the same dimensions and colsums as the input matrix.
This algorithm preserves differences among sites in species richness (= colsums), but assumes differences among species in commonness and rarity are proportional to observed species occurrences (= rowsums). sim5 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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