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st: HHI

From   Salima Bouayad Agha <>
Subject   st: HHI
Date   Mon, 20 Jun 2011 17:31:10 +0200

dear Statalists,

does anybody has any solution to compute an HHI (Hirshman-Herfindahl Index) on panel data. We had observation on a regional desagregated level (i) for 3 sectors(k), many years(t) and many countries (j) and we wanted to compute this index at the contry level for each year.

many thanks

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