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st: How to calculate mean of other individuals on the same group


From   "Quang Nguyen" <quangn@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: How to calculate mean of other individuals on the same group
Date   Tue, 13 Feb 2007 18:29:17 -1000

Dear all,

A simplified version of my data looks as follows:

ID      Group     X
1       a             5
2       a             7
3       a             9
4       a             8
5       b             3
6       b             4
7       b             9
..........................

I would like to generate a new variable whose value is the average of
other individual in the same group as the concerned individual. For
example, for the first individual (ID=1), this will be: (7+9+8)/3= 8.
For the 6th individual, this will be (3+9)/2=6 and so on.

I would highly appreciate if someone could suggest me a solution for this.
Thanks and Have A Great Day!
Sincerely yours,

Quang
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