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st: AW: Dropping all missing values


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Dropping all missing values
Date   Mon, 14 Dec 2009 17:32:24 +0100

<> 

Many estimation commands take care of the missing issue themselves, and the
rules for this game are in the manuals. 

Note that your commands are "double" illegal. -drop- with a -varlist- does
not take -if- qualifiers, and the -if- qualifier must state a variable that
is supposed to be missing. So your example should be something like 

*************
sysuse auto, clear
drop if rep78==.
drop if foreign==.
*************

i.e. w/o a -varlist-. Note also the function -mi()-


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Mosi Ifatunji
Gesendet: Montag, 14. Dezember 2009 17:30
An: Statalist
Betreff: st: Dropping all missing values

Friends,

I am at the final stage of dataset preparation and would like to
remove all missing values. I know that I can drop all missing values
with the following syntax:

drop x1 if == .
drop x2 if == .

But, because I am going to have quite a few variables in the final
dataset, I would prefer as short a command syntax as possible. Of
course the goals of such an exercise is to ensure that all of my
analysis for this study is based on the same cases.

Thank you so much,

Mosi

-- 
Mosi A. Ifatunji, Ph.D. Candidate
ASA Pre-Doctoral Fellow
University of Illinois at Chicago
Department of Sociology (MC 312)
1007 West Harrison Street
Chicago, Illinois 60607-7140
Phone: (312) 607-2825
Email: mosi@ifatunji.com
Web: http://www.uic.edu/depts/soci/
http://blackyouthproject.uchicago.edu/
http://www.2008andbeyond.com/
http://www.ifatunji.com/

"Power concedes nothing without a demand."
                          - Frederick Douglass, 1857
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