dplR (version 1.7.0)

gini.coef: Calculate the Gini Coefficient

Description

This function calculates the Gini coefficient on raw or detrended ring-width series.

Usage

gini.coef(x)

Arguments

x

a numeric vector

Value

the Gini coefficient.

Details

This calculates the Gini coefficient of inequality which is used as an all-lag measure of diversity in tree-ring records <U+2013> typically detrended series. Lower values indicate lower diversity. The use of the Gini coefficient in dendrochronology is described by Biondi and Qeadan (2008). See Handcock and Morris (1999) for more information. See ‘Examples’ for a pointer to a PDF document including mathematical details about the function.

References

Biondi, F. and Qeadan, F. (2008) Inequality in Paleorecords. Ecology, 89(4), 1056<U+2013>1067.

Handcock, M. S. and Morris, M. (1999) Relative Distribution Methods in the Social Sciences. Springer. ISBN: 0-387-98778-9.

See Also

rwl.stats

Examples

# NOT RUN {
docFile <- system.file("doc", "math-dplR.pdf", package="dplR")
cat("See the following PDF for mathematical details:\n")
cat(docFile, sep="\n")
# }
# NOT RUN {
if (interactive() && requireNamespace("Biobase")) {
    Biobase::openPDF(docFile)
}
# }
# NOT RUN {
library(utils)
data(ca533)
ca533.rwi <- detrend(rwl = ca533, method = "ModNegExp")
ca533.crn <- chron(ca533.rwi, prefix = "CAM")
gini.coef(ca533.crn)
# }