spec_sample | R Documentation |

Expected species richness in a random sample of fixed size.

```
spec_sample(abund_vec, n)
```

`abund_vec` |
Species abundance distribution of the community (integer vector) |

`n` |
Sample size in terms of number of individuals (integer) |

The expected number of species is calculated after Hurlbert 1971, Equation 3.

`spec_sample`

is similar to the function `rarefy`

in the R package `vegan`

.

Expected number of species in a sample of n individuals

Hurlbert, S.H. 1971. The nonconcept of species diversity: a critique and + alternative parameters. Ecology 52, 577-586.

```
sad1 <- sim_sad(100, 1000)
spec_sample(abund_vec = sad1, n = 20)
```

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