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st: RE: collapsed data or the original


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: collapsed data or the original
Date   Thu, 24 Jun 2010 17:34:26 +0100

It shouldn't matter how you calculate a mean. 

I don't think your claim can be discussed without an example. 

Nick 
n.j.cox@durham.ac.uk 

riyadh shamsan

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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