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AW: st: Collapse with sum function and missing values


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: Collapse with sum function and missing values
Date   Thu, 11 Feb 2010 13:03:57 +0100

<> 


" Interestingly,

. su rep78 if rep78==0, detail"



But that is not the surprising part, since there are no "0" values for
"rep78". The weird thing is that 


*************
su rep78 if rep78==.,d
*************

returns "no observations" whereas -su rep78 if rep78==.- reports 0
observations.

HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Kit Baum
Gesendet: Donnerstag, 11. Februar 2010 12:57
An: statalist@hsphsun2.harvard.edu
Betreff: RE: st: Collapse with sum function and missing values

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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