shannon {pgirmess}R Documentation

Computes Shannon's and equitability indices

Description

Computes Shannon's and equitability indices

Usage

shannon(vect, proba=TRUE)

Arguments

vect a probability vector whose sum = 1 or a frequency vector
proba FALSE if the vector is frequencies and not probabilities

Details

Computes Shannon's and equitability indices. The vetor passed can be a probability vector whose sum equal 1 or a vector of frequencies (e.g. the number of food item of each category). In this case the argument proba must be set to FALSE.

Value

A vector of two values: Shannon's and equitability indices

See Also

shannonbio

Examples


x<-c(0.1,0.5,0.2,0.1,0.1)
sum(x)
shannon(x)

x<-rpois(10,6)
shannon(x, proba=FALSE)


[Package pgirmess version 1.3.7 Index]