OasisR (version 2.0.1)

NShannon: A function to compute Shannon-Wiener diversity normalized index

Description

The Shannon-Wiener diversity index is based on the notion of entropy and measures population heterogeneity.

Usage

NShannon(x)

Arguments

x

- an object of class matrix (or which can be coerced to that class), where each column represents the distribution of a population group, within spatial units. The number of columns should be greater than 1 (at least 2 population groups are required). You should not include a column with total population in each unit, because this will be interpreted as a group.

Value

Shannon-Wiener normalized diversity index

References

Shannon C. E. (1948) A mathematical theory of communication. Bell System Technical Journal (27)

See Also

Other multigroup eveness indices: HShannon, ISimpson, GiniMulti, DMulti, HMulti, CMulti

Other multigroup indices: PMulti, RelDivers

Examples

# NOT RUN {
x <- segdata@data[ ,1:2]
NShannon(x) 
# }