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st: Average of Sample vesus Sub-Samples


From   Erasmo Giambona <e.giambona@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: Average of Sample vesus Sub-Samples
Date   Fri, 19 Mar 2010 13:09:26 +0100

Dear Statalisters,

Is it possible that the arithmetic average of a sample is larger than
the averages of two sub-samples containing overall all the
observations of the full samples?

Any thoughts would be appreciated,

Erasmo
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