conc

From ineq v0.2-13 by Achim Zeileis

Concentration Measures

computes the concentration within a vector according to the specified concentration measure

Keywords: univar

Usage

conc(x, parameter = NULL, type = c("Herfindahl", "Rosenbluth"), na.rm = TRUE)
Herfindahl(x, parameter = 1, na.rm = TRUE)
Rosenbluth(x, na.rm = TRUE)

Arguments

x: a vector containing non-negative elements
parameter: parameter of the concentration measure (if set to NULL the default parameter of the respective measure is used)
type: character string giving the measure used to compute concentration. must be one of the strings in the default argument (the first character is sufficient). defaults to "Herfindahl".
na.rm: logical. Should missing values (NAs) be removed prior to computations? If set to FALSE the computations yield NA.

Details

conc is just a wrapper for the concentration measures of Herfindahl and Rosenbluth (Hall / Tiedemann / Rosenbluth). If parameter is set to NULL the default from the respective function is used.

Value

the value of the concentration measure

References

F A Cowell: Measurement of Inequality, 2000, in A B Atkinson / F Bourguignon (Eds): Handbook of Income Distribution, Amsterdam,

F A Cowell: Measuring Inequality, 1995 Prentice Hall/Harvester Wheatshef,

M Hall / N Tidemann: Measures of Concentration, 1967, JASA 62, 162-168.

Examples

# generate vector (of sales)
x <- c(541, 1463, 2445, 3438, 4437, 5401, 6392, 8304, 11904, 22261)
# compute Herfindahl coefficient with parameter 1
conc(x)
# compute coefficient of Hall/Tiedemann/Rosenbluth
conc(x, type="Rosenbluth")

Documentation reproduced from package ineq, version 0.2-13, License: GPL-2 | GPL-3

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