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Dominance Index

Source: R/dom.R
concstats_dom.Rd

An alternative measure which can be used in case of mergers.

Usage

concstats_dom(x, na.rm = TRUE, digits = NULL)

Arguments

x

A non-negative numeric vector.

na.rm

A logical vector that indicates whether NA values should be excluded or not. Must be either TRUE or FALSE. The default is TRUE. If set to FALSE the computation yields a warning if the vector contains NA values. NAs will be removed for further computations.

digits

An optional value for digits. Specifies the minimum number of significant digits to be printed in values. The default is NULL and will use base R print option.

Value

A single numeric measure in decimal form or, if NAs are present, with a warning.

Details

concstats_dom calculates a dominance index, which measures the concentration within the Herfindahl-Hirschman index, that is, the concentration within the concentration.

References

Garcia Alba Idunate, P. (1994). "Un Indice de dominancia para el analisis de la estructura de los mercados". El Trimestre Economico, 61: 499-524.

See also

Other Competition/Concentration measures: concstats_all_comp(), concstats_comp(), concstats_hhi(), concstats_hhi_d(), concstats_hhi_min(), concstats_sten()

Examples

# a vector of market shares
x <- c(0.35, 0.4, 0.05, 0.1, 0.06, 0.04)
concstats_dom(x, na.rm = FALSE, digits = 2)
#> [1] 0.45

# a vector with NA values
x <- c(0.4, 0.2, 0.25, 0.1, 0.05, NA)
concstats_dom(x, digits = 2)
#> `x` has NA values. NAs have been removed for computation.
#> [1] 0.41