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Re: st: keeping an inventory of dropped observations


From   Michael McCulloch <mm@pinest.org>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: keeping an inventory of dropped observations
Date   Fri, 30 Mar 2007 09:59:19 -0700

Thank you very much, Friedrich.

drop if mark_for_drop > 0

Also, in the first -label define- command, the -modify- option is not
needed.

Friedrich

--- Friedrich Huebler <huebler@rocketmail.com> wrote:

 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








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