concstats is a small package that helps you to **calculate the structure,
concentration or diversity measures of a given market.**

You can reach that goal in different ways:

a) calculating an individual measure, e.g. the Herfindahl Hirschman Index (HHI)
or its dual.

b) calculating a group of measures, e.g. structural measures, or

c) a set of pre-selected measures in a one-step procedure.

You can install `concstats`

directly from CRAN

install.packages("concstats") # Market Structure, Concentration, and Inequality # Measures library(concstats)

You can install the development versions from

*r-universe*

install.packages("concstats", repos = "https://ropensci.r-universe.dev")

*github* (requires `remotes`

or `devtools`

)

remotes::install_github("ropensci/concstats"

Measures of concentration and competition are important and give a first insight
of a given market structure in a particular market.

**They are important to determine public policies and strategic corporate
decisions**. However, in research and in practice the most commonly used measure
is the Herfindahl Hirschman Index. The `concstats`

package offers a **set of
alternative measures**.

`concstats`

allows you to **calculate quickly a particular measure or a group of
measures to give you a better overview of a given market situation and therefore
reducing uncertainty.** **It can be used by practitioners and academics alike.**

#' @srrstats {EA1.0} identifying target audience on line#60 #' @srrstats {EA1.2} scope of the package on line#61-62

`concstats`

should be used by practitioners and academics **who are concerned
about structure, concentration, diversity or inequality** in general or on a
regular basis. **A single standard measure like the Herfindahl Hirschman Index
(HHI) may lead to erroneous conclusions.**
The `concstats`

package offers a **straightforward way to calculate standard
and alternative measures** given a data set of market participants and their
participation (in relative values) in a particular market at a given point of
time or over time.
concstats provides currently the following basic functions:

calculates eight pre-selected measures in a one-step procedure to provide a first insight of the market. The resulting data frame contains eight measures, which are: number of firms with market share, numbers equivalent, the cumulative share of the top (top 3 and top 5) firm(s) in percentage, the hhi index, the entropy index, and the palma ratio.`concstats_concstats()`

is a wrapper for the following measures:`concstats_mstruct()`

**firm**,**nrs_eq**(Numbers equivalent),**top**,**top 3**and**top 5**market share, and**all**calculates all measures as a group. Each of the measures within a group can be accessed directly using the prefix**concstats_**, e.g.**concstats_firm**.is a group wrapper for the following concentration measures:`concstats_comp()`

**hhi**, the**dual of the hhi**, the**min. of the hhi**, the**dominance index**, the**stenbacka index**, and finally**all**which calculates all measures as a group.is a wrapper for inequality and diversity measures and contains:`concstats_inequ()`

**entropy**,**gini coefficient**,**simpson index**, the**palma ratio**and the alternative**grs**measure,**all**calculates the group measures.

**Any scripts or data that you put into this service are public.**

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