hh {politicsR}

Herfindahl–Hirschman concentration index

Description

'hh()' calculates the Herfindahl–Hirschman concentration index.

Usage

hh(x)

Arguments

x

(numeric). A numeric vector in the form of a proportion of votes or seats. The vector should range from 0 to 1.

Value

The result of the index is a value between 0 and 1. The closer to zero, the lower the concentration; the closer to 1, the higher the concentration.

References

Hirschmaņ, Albert O. (1945). National Power and Structure of Foreign Trade, Berkley: Univ of California Press.

Herfindahl, Orris C. (1950). Concentration in the us steel industry. Unpublished PhD. Dissertation, Columbia University.

Examples

hh(c(0.2, 0.3, 0.5))