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st: collapsed data or the original

From   riyadh shamsan <>
Subject   st: collapsed data or the original
Date   Thu, 24 Jun 2010 17:30:00 +0100

when you use collapse and examine the mean values they turn to be
different from the original set when using the by option.

So for example if you have a time series and it is a monthly data so
you will go:

summ y, by (time)

when you collapse your data and use the mean option your result won't
be the same. Is this correct?
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