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Re: st: RE: collapsed data or the original


From   riyadh shamsan <onlineriyadh@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: collapsed data or the original
Date   Thu, 24 Jun 2010 18:03:02 +0100

many thanks Nick

On Thu, Jun 24, 2010 at 5:34 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> 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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