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st: Sum over all possible combinations


From   "J E" <je_123@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Sum over all possible combinations
Date   Fri, 20 Jul 2007 22:21:25 -0500

Dear statalisters

I am interested in computing the sum of the absolute value of all possible differences within a group of my sample.

Suppose that the variable "group" denotes the variable indicating the group to which an individual belongs and Y is an outcome variable. I am interested in computing

sum of abs (Yi-Yj) for all i and j belonging to group K

My programming skills are almost none. Can somebody help me out regarding an efficient way of computing such statistic?

Thanks in advance

Julio

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