Description Usage Arguments Details Value Note References Examples

Randomizes a binary matrix speciesData by reshuffling all of its elements equiprobably.

1 | ```
sim1(speciesData)
``` |

`speciesData` |
binary presence-absence matrix (rows = species, columns = sites). |

This algorithm assumes species and sites are equiprobable. It preserves the total matrix fill, but places no other constraints on row or column totals.

Returns a binary presence-absence matrix with the same dimensions and percent fill as the input matrix.

This is the simplest of all randomization algorithms for a presence- absence matrix. However, it assumes that both species and sites are equiprobable, and has poor Type I error frequencies when tested with purely random matrices. If the input matrix is sparse, it will often generate null matrices with empty rows or columns. Not recommended for co-occurrence analysis.

Gotelli, N.J. 2000. Null model analysis of species co-occurrence patterns. Ecology 81: 2606-2621.

1 |

EcoSimR documentation built on May 29, 2017, 9:11 p.m.

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