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st: Calculate the mean of y if there are many similar x


From   Eik Leong Swee <eikswee@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Calculate the mean of y if there are many similar x
Date   Thu, 17 Mar 2005 20:44:50 -0800 (PST)

Hello. I have a problem here trying to sort my data. I have 2 variables y and x. Each one is of
length 15000. However, y is unique but x is not i.e. for some values of y, there are more than one
x. Specifically, there are 3573 unique values of x. I wish to take the mean of y for those x's
that are the same, so that I end up only with a unique set of 3573 (y,x). I can either manually
compute the mean 3573 times, or hopefully someone out there knows a command I can use. THANKS A
LOT in advance!




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