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McIntosh Dominance Index.

Usage

index_mcintosh(x, ...)

# S4 method for numeric
index_mcintosh(x, evenness = FALSE, na.rm = FALSE, ...)

Arguments

x

A numeric vector of count data (absolute frequencies).

...

Currently not used.

evenness

A numeric scalar: should evenness be computed?

na.rm

A numeric scalar: should missing values (including NaN) be removed?

Value

A numeric vector.

Details

The McIntosh index expresses the heterogeneity of a sample in geometric terms. It describes the sample as a point of a \(S\)-dimensional hypervolume and uses the Euclidean distance of this point from the origin.

This is a dominance index, so that an increase in the value of the index accompanies a decrease in diversity.

References

McIntosh, R. P. (1967). An Index of Diversity and the Relation of Certain Concepts to Diversity. Ecology, 48(3), 392-404. doi:10.2307/1932674 .

Author

N. Frerebeau