I do not know if this is what you want, but take a look at the "External links" at the bottom of the Wikipedia page: http://en.wikipedia.org/wiki/Theil_index Ravi -- View this message in context: http://r.789695.n4.nabble.com/U-de-Theil-tp2164441p2164458.html Sent from the R help mailing list archive at Nabble.com.