## Calculating herfindahl index in stata

Tip 4: Calculation of Herfindahl-Hirschman Index - HHI _____ The market concentration (HHI) is calculated by squaring the market share of each bank/firm competing in a market, and then summing the resulting numbers. First, before we calculate HHI using Stata, install the package: Tips for Stata The Herfindahl-Hirschman Index (HHI) is a commonly accepted measure of market concentration. It is calculated by squaring the market share of each firm competing in a market and then summing the

30 Oct 2014 Insurer market concentration (HHI) and care group market share were not For one GGD-region the HHI-index could not be calculated, as no All analyses were conducted using the statistical software STATA (version 10.0). 7 Jan 2011 Using this database, we calculate for all countries and years three classes of 4 Fitted curves for Herfindahl and Gini indices have similar shapes. 'Difference' and 'System' GMM in Stata”; Center for Global Development. An alternative measure is the trade entropy index. * Definition: Regional Hirschmann-Herfindahl Index is defined as the sum across destinations of the squared export shares for the region under study to all destinations. * (RHHI) Range: Regional Hirschmann-Herfindahl Index takes Range of values between (0 & 1). You should read the help for genearate and egen, but before you can implement the right commands, you will also want to nail down the definition of the HHI: egen double sasset=sum (asset), by (state year) bysort state year: g double shsqrd= (asset/sasset)^2 egen double HHI=sum (shsqrd), by (state year)

## 10 We perform all estimations in Stata. We fit SUR through the command This is calculated as the inverse of the Herfindahl-Hirschman Index. (HHI) based on

coordinated effect analysis and calculation of the Herfindahl-Hirschman Index. Although it using Stata, Konkurrensverket Working Series Paper 2 (2013). 81  10 We perform all estimations in Stata. We fit SUR through the command This is calculated as the inverse of the Herfindahl-Hirschman Index. (HHI) based on  Market concentration can be calculated by the market The Herfindahl- Hirschman index ('HHI') is a statistical measure of concentration and is used in In practice, the Regression Adjustment function in STATA can be used to estimate the. The Herfindahl index is a measure of the size of firms in relation to the industry and an indicator of the amount of competition among  In structural models, concentration ratios (i.e. Herfindahl-Hirschman (HHI) 4 This index is calculated as market share of the k largest banks in all banking assets. coefficients on non-balanced data panel, the STATA 9.2 package was used. 30 Oct 2014 Insurer market concentration (HHI) and care group market share were not For one GGD-region the HHI-index could not be calculated, as no All analyses were conducted using the statistical software STATA (version 10.0). 7 Jan 2011 Using this database, we calculate for all countries and years three classes of 4 Fitted curves for Herfindahl and Gini indices have similar shapes. 'Difference' and 'System' GMM in Stata”; Center for Global Development.

### Basically the Herfindahl index is an indicator of the level of competition of a given market. Therefore you must have just one value for this index to characterize a given market (it does not vary across companies on this market). When you use the commands I wrote you do end up with one observation corresponding to the index for your dataset.

15 Jan 2016 We calculate the CSM measure for each firm using all available Herfindahl- Hirschman Index (HHI), a measure of industry concentration. 5 We implement these quantile regressions using qreg2 Stata command developed  Lerner index thus suggesting greater market power. However and the UK, we calculate concentration measures using the Herfindahl-Hirshman index and the 5 - Stata. Center for Global Development, Working Paper N. 103, December.

### hhi5 generates Herfindahl-Hirschman index (HHI) variables also commonly known as concentration index in economics and finance. The module supports multiple variables and group ids and allows user to export output in table format (csv comma delimited).

Tip 4: Calculation of Herfindahl-Hirschman Index - HHI _____ The market concentration (HHI) is calculated by squaring the market share of each bank/firm competing in a market, and then summing the resulting numbers. First, before we calculate HHI using Stata, install the package: Tips for Stata The Herfindahl-Hirschman Index (HHI) is a commonly accepted measure of market concentration. It is calculated by squaring the market share of each firm competing in a market and then summing the Dear all, I am looking to calculate the Herfindahl index over the variable "industry" by group "ID" in a time-variant manner "date". Observations per ID are sorted in time-ascending order and the HHI should be re-calculated at each date, taking into consideration all previous data for the respective ID. hhi5 generates Herfindahl-Hirschman index (HHI) variables also commonly known as concentration index in economics and finance. The module supports multiple variables and group ids and allows user to export output in table format (csv comma delimited). Since 1982, the U.S. Department of Justice, the Federal Trade Commission, and state attorneys general have used the Herfindahl-Hirschman Index (HHI) to measure market concentration for purposes of antitrust enforcement. The HHI of a market is calculated by summing the squares of the percentage market shares held by the respective firms. Academia.edu is a platform for academics to share research papers.

## 1 Jan 2015 Tabmiss, summarizing missing data in Stata. betaprior Module to calculate the parameters of a Beta distribution given the mean and hurdle regression hhi Module to compute Herfindahl index hildasetup Module to create

To calculate the Herfindahl Index, you'll need to know the market share for each company that's competitive in the market in question. Square the market share of each company, then add together each result. The resulting sum is the Herfindahl Index.

Dear all, I am looking to calculate the Herfindahl index over the variable "industry" by group "ID" in a time-variant manner "date". Observations per ID are sorted in time-ascending order and the HHI should be re-calculated at each date, taking into consideration all previous data for the respective ID. hhi5 generates Herfindahl-Hirschman index (HHI) variables also commonly known as concentration index in economics and finance. The module supports multiple variables and group ids and allows user to export output in table format (csv comma delimited).