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RE: st: Collapse with sum function and missing values


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: Collapse with sum function and missing values
Date   Thu, 11 Feb 2010 06:57:21 -0500

On Feb 11, 2010, at 2:33 AM, N.J. Cox wrote:

> - -summarize- 
> ===========
> 
> . sysuse auto
> (1978 Automobile Data)
> 
> . su rep78 if rep78 == .
> 
>    Variable |       Obs        Mean    Std. Dev.       Min        Max
> - -------------+--------------------------------------------------------
>       rep78 |         0
> 
> . ret li
> 
> scalars:
>                  r(N) =  0
>              r(sum_w) =  0
>                r(sum) =  0


Interestingly,

. su rep78 if rep78==0, detail

                     Repair Record 1978
-------------------------------------------------------------
no observations



Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
                              An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html


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