basic syntax: hhi var, by(varlist) [if exp] [in range] [outfile, replace]
Description: hhi generates Herfindahl-Hirschman index variables also commonly known as conce > ntration index in economics and finance. The module supports multiple variabl > es and group ids and allows user to export output in table format (csv comma > delimited).
Options ------- by(varlist): allows multiple groups defined by `varlist' e.g. (year, country, r > egion) outfile: export data in table format (.csv comma delimited)
Examples: ---------- hhi x1 x2 hhi x1, by (year country region) hhi x1, by (year country region) outfile
hhi x1 x2 x3, by(year country region) hhi x1 x2 x3, by(year country region) outfile replace
Author Muhammad Rashid Ansari INSEAD Business School 1 Ayer Rajah Avenue, Singapore 138676 > rashid.ansari@insead.edu