Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: keeping an inventory of dropped observations


From   Friedrich Huebler <huebler@rocketmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: keeping an inventory of dropped observations
Date   Fri, 30 Mar 2007 08:10:09 -0700 (PDT)

Michael,

You could save all dropped observations in a separate dataset and
identify the reasons for dropping them with value labels.

gen mark_for_drop=0
replace mark_for_drop=1 if eodlymph==99
lab def reason_for_drop 1 "missing lymph", modify
replace mark_for_drop=2 if xyz==99
lab def reason_for_drop 2 "missing xyz", modify
...
lab val mark_for_drop reason_for_drop
preserve
keep if mark_for_drop > 0
save dropped.dta
tab mark_for_drop
restore
drop if if mark_for_drop > 0
save clean.dta

Friedrich

--- Michael McCulloch <mm@pinest.org> wrote:
> Hello,
> While cleaning a dataset, I'm periodically dropping observations
> that 
> meet certain criteria, for example:
> drop if eodlymph==99
> 
> Since this occurs very often within a long do-file, I'd like to
> keep 
> an inventory of dropped observations & my reason for doing so.
> Aside 
> from manually searching through my log file, is there a more
> elegant 
> way than what I suggest below, to do this?
> 
> For example:
> gen mark_for_drop=0
> gen reason_for_drop=.
> replace mark_for_drop=1 if eodlymph==99
> replace reason_for_drop="missing lymph" if eodlymph==99
> ...
> drop if eodlymph==99
> ...
> tab mark_for_drop reason_for_drop if reason_for_drop==1
> 
> 
> Many thanks,
> Michael
> 
> 
> 
> -- 
> 
> Michael McCulloch, LAc, MPH
> Research Director
> Pine Street Foundation
> 124 Pine St
> San Anselmo, CA 94960-2674
> Tel:	(415) 407-1357
> Fax:	(415) 485-1065
> mcculloch@pinestreetfoundation.org



 
____________________________________________________________________________________
Expecting? Get great news right away with email Auto-Check. 
Try the Yahoo! Mail Beta.
http://advision.webevents.yahoo.com/mailbeta/newmail_tools.html 
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   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   |   What's new   |   Site index