mcintosh_e {abdiv} R Documentation

## McIntosh's evenness measure E

### Description

McIntosh's evenness measure E

### Usage

mcintosh_e(x)


### Arguments

 x A numeric vector of species counts.

### Details

For a vector x of raw species counts, the McIntosh evenness measure is

E = \frac{√{∑_i x_i^2}}{√{(N - S + 1)^2 + S - 1},}

where N is the total number of counts and S is the total number of species observed.

This index is appropriate only for raw counts, not transformed counts or proportions.

Equivalent to mcintosh_e() in skbio.diversity.alpha.

### Value

McIntosh's evenness measure, 0 < E ≤q 1. The index is undefined when the total number of counts is 0, in which case we return NaN.

### References

Heip C, Engels P. Comparing Species Diversity and Evenness Indices. J. Mar. Bioi. Ass. U.K. 1974;54:559-563.

### Examples

x <- c(15, 6, 4, 0, 3, 0)
mcintosh_e(x)


[Package abdiv version 0.2.0 Index]