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Re: st: smart averaging


From   Fernando Rios Avila <f.rios.a@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: smart averaging
Date   Wed, 22 Feb 2012 19:58:03 -0500

Hi,
If you are trying to average it only for those without missing
variables, the easier process could be:
1. identify number of missing observations by id
2. average for all
3. replace by missing value if the number of missing values is higher than 0
F

On Wed, Feb 22, 2012 at 7:54 PM, Murat Mercan <mamercan@gmail.com> wrote:
> Hi,
>
> I have the following problem I have been unable to decipher. I have the
> following data set:
> id      year       income
> 1       2006      100
> 1       2007      50
> 1       2008       .
> 1       2009       .
> 2       2006       50
> 2       2007       50
> 2       2008       50
> 2       2009       50
> I want to average the income variable for those four years. I tried to use
> the following command:
>
> bys  id: egen average_inc = mean(income) if inrange( year,2006,2009)
>
> However, that averages person 1's income, too. I need to average just
> person 2's income.
> Can anyone suggest how to do that?  Thank you in advance.
> Murat
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