ISimpson: A function to compute Simpson's interaction index
Description
Simpson's interaction index measures the probability
that randomly selected individuals are not in the same group.
Usage
ISimpson(x)
Value
Simpson's interaction index
Arguments
x
- an object of class matrix (or which can be coerced to that class),
where each column represents the distribution of a group within
spatial units. The number of columns should be greater than 1 (at least 2
groups are required). You should not include a column with total
population, because this will be interpreted as a group.
References
Simpson E. H. (1949) Measurement of diversity.
Nature 163:688