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The h-index, created by Jorge E. Hirsch in 2005, is an attempt to measure the research impact of a scholar. In his 2005 article Hirsch put forward an easily computable index, h, which gives an estimate of the importance, significance, and broad impact of a scientist's cumulative research contributions..
Herfindahl-Hirschman Index Example Calculations. The HHI is calculated by taking the market share of each firm in the industry, squaring them, and summing the result: HHI = s1^2 + s2^2 + s3^2 + ... + sn^2 (where s is the market share of the each firm expressed as a whole number, not a decimal)