Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: panel data: drop a whole group/identifier


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: panel data: drop a whole group/identifier
Date   Wed, 17 Aug 2011 16:03:17 +0100

No; you can do this under the aegis of -by:- so long as you feed it
the right information.

gen isbad = year == 2006 & something_bad_is_true
bysort panelid (isbad) : drop if isbad[_N]

See also

SJ-11-2 dm0055  . . . . . . . . . . . . . .  Speaking Stata: Compared with ...
       . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
       Q2/11   SJ 11(2):305--314                                (no commands)
       reviews techniques for relating values to values in other
       observations

On Wed, Aug 17, 2011 at 3:54 PM, Sabrina Helmut <vitamint@hotmail.de> wrote:

> I sorted my panel data by year (2004-2006) and identifier. Now, I want to drop the identifier for the whole panel (2004-2006) if a certain condition let's say for one of the years (2006) is not fulfilled. What is the correct command for dropping whole groups (characterised by a specific identifier)? I already tried the "by" command but think that this doesn't help to drop a whole group. "By" would only drop the year where the condition is not fulfilled and the remaining identifier-year observations are kept. Am I right?

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index