R: Calculate the Gini Coefficient

gini.coef {dplR} | R Documentation

## 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

### Details

This calculates the Gini coefficient of inequality which is used as an all-lag measure of diversity in tree-ring records – 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.

### Value

the Gini coefficient.

### Author(s)

Mikko Korpela, based on original by Andy Bunn

### References

Biondi, F. and Qeadan, F. (2008) Inequality in Paleorecords. Ecology, 89(4), 1056–1067.

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

    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)
    }
    ## End(Not run)
    library(utils)
    data(ca533)
    ca533.rwi <- detrend(rwl = ca533, method = "ModNegExp")
    ca533.crn <- chron(ca533.rwi, prefix = "CAM")
    gini.coef(ca533.crn)

[Package dplR version 1.7.2 Index]