pgirmess (version 1.4.0)

shannon: 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

Value

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

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.

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)