EcoSimR (version 0.1.0)

c_score_skew: CScoreSkew Co-occurrence Metric

Description

Takes a binary presence-absence matrix and returns the skewness of the Stone and Roberts' (1990) C-score.

Usage

c_score_skew(m = matrix(rbinom(100, 1, 0.5), nrow = 10))

Arguments

m

a binary presence-absence matrix in which rows are species and columns are sites.

Value

Returns the skewness of the C-score calculated across all possible species pairs in the matrix.

Details

A large positive value of skewness implies a preponderance of species pairs with large C-score values (segregated), whereas a large negative value of skewness implies a preponderance of species pairs with small C-score values (aggregated).

References

Stone, L. and A. Roberts. 1990. The checkerboard score and species distributions. Oecologia 85: 74-79.

Stone, L. and A. Roberts. 1992. Competitive exclusion, or species aggregation? An aid in deciding. Oecologia 91: 419-424.

See Also

c_score co-occurrence index.

Examples

skewCScore <- c_score_skew(m=matrix(rbinom(100,1,0.5),nrow=10))