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Market Structure Measures

Source: R/mstruct.R
concstats_mstruct.Rd

Set of different market structure measures to reflect a given market structure.

Usage

concstats_mstruct(x, type = c("firm", "nrs_eq", "top", "top3", "top5",
 "all"), na.rm = TRUE, digits = NULL)

Arguments

x

A non-negative numeric vector.

type

A character string of the measure to be calculated, can be abbreviated with the first letter. Defaults to "firm". Input is not case-sensitive.

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 NA if vector contains NA values.

digits

A non-null 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. Significant digits defaults to 7.

Value

A single calculated numeric measure or data frame.

Details

  • concstats_mstruct is a wrapper for the proposed structural measures.

  • concstats_firm(), returns the number of firms with a given market share.

  • concstats_nrs_eq() computes the reciprocal of the HHI, which indicates the equivalent number of firms of the same size.

  • concstats_top(), concstats_top3(), and concstats_top5() calculate the cumulative share of the top (top 3 and top 5) firm(s) and returns the value in percentage.

  • concstats_all_mstruct() computes all measures in a one step procedure. All measures can be computed individually.

  • concstats_top_df(), concstats_top3_df(), and concstats_top5_df() are slight variations. Firm id or ranking might be of interest. In this case an additional id or firm variable is needed. The functions will return a data frame. These functions are just individually accessible.

Note

The vector of market shares should be in a decimal form corresponding to total shares of individual firms/units.The sum of the vector should sum up to 1. Alternatively, the user might use concstats_shares() to converting raw variables, e.g. loans or sales into shares.

See also

concstats_concstats(),concstats_comp(),concstats_inequ()

Other Market structure measures: concstats_all_mstruct(), concstats_firm(), concstats_nrs_eq(), concstats_top(), concstats_top3(), concstats_top3_df(), concstats_top5(), concstats_top5_df(), concstats_top_df()

Examples

# a vector of market shares
x <- c(0.35, 0.4, 0.05, 0.1, 0.06, 0.04)

# the number of firms with market share
concstats_mstruct(x, type = "firm")
#> [1] 6
# Calculate top market share individually
concstats_top(x)
#> [1] 40
# Calculate the market structure group measures
concstats_mstruct(x, type = "all", digits = 2)
#>          Measure Value
#> 1          Firms   6.0
#> 2 Nrs_equivalent   3.3
#> 3        Top (%)  40.0
#> 4       Top3 (%)  85.0
#> 5       Top5 (%)  96.0