2020年9月29日 · You can calculate Herfindahl Index by squaring the market share for each firm (up to 50 firms) and then adding the squares. In a perfectly competitive market, HHI should approach zero. Let's say there are thousands of restaurants in your city, but the top 50 each have 0.1% of the market share. The HHI is 0.12 x 50 = 0.5.

2020年4月1日 · When I calculate it in excel, I summate the market shares of all firms in a particular year to get HHI. Doing same thing for all years, finally I get a series of HHI values for each year. So in a way I converted my panel data of ms into a time series data of HHI. However I need a panel of HHI to run the panel analysis.

2024年4月29日 · Hi, I'm trying to calculate HHI indexes starting from a tab command. Manually, I just grab the percentages and put them in the new variable; but I wonder if there is a way to automate the process. In my data I have to do this 40 times (I have 2 sectors and 20 regions)!

2019年2月20日 · I am seeking similar assistance on HHI index based on total income and total assets per credit union in each country similar to that of Mohina. I would like to compute the hhi yearly for each credit union per island country. I would like to compute the concentration ratio per island for each credit union for each year.

2021年6月9日 · I think it was working before --hhi was doing what the definitions imply. Otherwise, it comes down to your chosen units. Otherwise, it comes down to your chosen units. A sum of squared probabilities can't exceed 1, if you wish to report that as a percent of possible it can't exceed 100 and if you wish to report it as a sum of squared ...

2018年10月11日 · I have a data set with 38 firms with quarterly data spanning from 1996 to 2018. I would like to create an HHI index based on total revenue for dataset. Variable name: Revenue: totalrevenue Time: quarter1 Firm identifier: firmid Thanks for any help.

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2018年7月8日 · I want to calculate heteroskedasticity after qregpd regression. Could you please help me how can I perform the test. Are there any other post tests require after qregpd regression. Please help. With Kind Regards Sabyasachi

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