## Calculating herfindahl index in stata

1 A considerable amount of resources for learning and using STATA can be found If concentration indices such the Herfindahl index are calculated over active

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) 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.

## is a Herfindahl index of the plant j size in terms of employment z for all J plants in the industries over time. In Panel A, we calculate γ using districts as the spatial unit of analysis and find Ben Jann's kdens routine in STATA provides the.

The U-shaped relation between the Herfindahl index of crop specialization and the extent The effective market size for village i, as defined in equation (3), 19 Both of these are done by using the u-test program in Stata written by Lind and  leading employment website CareerBuilder.com, we calculate labor market Hirschman Index (HHI), which have the advantage that they can be compared with the thresh- “PLAUSEXOG: Stata module to implement Conley et al's plausibly. is a Herfindahl index of the plant j size in terms of employment z for all J plants in the industries over time. In Panel A, we calculate γ using districts as the spatial unit of analysis and find Ben Jann's kdens routine in STATA provides the. In other words, the Herfindahl index is calculated for each farm separately simultaneously obtained using STATA and are reported in Tables 5 and 6. Both half

### This video shows how to calculate the HHI using several examples. Herfindahl-Hirschman Index (HHI): Measuring Market Concentration Economics in Many Lessons.

The U-shaped relation between the Herfindahl index of crop specialization and the extent The effective market size for village i, as defined in equation (3), 19 Both of these are done by using the u-test program in Stata written by Lind and

### Herfindahl-Hirschman and Entropy t Develop a t The Herfidahl-Hirschman index: HH = n i=1 t Concentration ratio index: Ck = is calculated for j increasing.

is a Herfindahl index of the plant j size in terms of employment z for all J plants in the industries over time. In Panel A, we calculate γ using districts as the spatial unit of analysis and find Ben Jann's kdens routine in STATA provides the.

## The Herfindahl-Hirschman Index is an index that measures the market concentration of a given industry. A highly concentrated industry is one where only a few players in the industry hold a large percentage of the market share, leading to a near-monopolistic situation.

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) 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.

-search Herfindahl-Hirschman- will take you to some promising user-written commands. Kind regards, Carlo (Stata 16.0 SE)  Downloadable! hhi computes Herfindahl-Hirschman index also commonly known as concentration measure in economics and finance and Simpson index in  Downloadable! hhi5 generates Herfindahl-Hirschman index (HHI) variables also commonly known as concentration index in economics and finance. 16 Mar 2015 Tip 1: Steps for preparing data for Stata (panel format): Import the data into Stata, 3. Tip 4: Calculation of Herfindahl-Hirschman Index - HHI  {p2col :{hi:hhi5} {hline 2}}generates Herfindahl-Hirschman index (HHI) with the highest top # values of each variable in {varlist} to calculate the HHI index. { stata "hhi5 sale hour, by(industry race) prefix(hhi5) top(5) minobs(10)":hhi5 sale  25 Nov 2015 This paper aims to prove that the Herfindahl-Hirschman Index (HHI), which is Herfindahl proposed the index calculating the market concentration code specific Herfindahl Hirschman index a pplying STATA software.