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| From | Nick Cox <njcoxstata@gmail.com> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: RE: identifying observations where multiple conditions are met |
| Date | Wed, 13 Nov 2013 21:08:19 +0000 |
In addition to several useful comments in this thread, note that the thread started earlier today in http://www.stata.com/statalist/archive/2013-11/msg00512.html asks an essentially similar question. If it's OK to be either 0 (always) or 1 (always) then a direct evaluation of that is bysort id (type) : gen OK = inlist(type, 0, 1) & (type[1] == type[_N]) after which edit if !OK or list if !OK identifies problems. Nick njcoxstata@gmail.com On 13 November 2013 20:50, Sergiy Radyakin <serjradyakin@gmail.com> wrote: > On Wed, Nov 13, 2013 at 3:42 PM, Michael McCulloch > <mm@pinestreetfoundation.org> wrote: >> Thanks Elizabeth, yes it's all -id-, where "sometimes type==0, sometimes type==1, that I'm looking for. > > which means sd(type)!=0 within an ID group, hence see my code. > to see particular IDs: tabulate id if flag > to drop all 'problematic' obs: drop if flag > Sergiy > >> >> The code you suggest makes sense, however at the -collapse- stage, the records disappear -id- in which the "sometimes 0 / sometimes 1" existed prior to -collapse-. >> >> >> >> Best wishes, >> Michael McCulloch >> >> -- >> Pine Street Foundation, since 1989 >> 124 Pine Street | San Anselmo | California | 94960-2674 >> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org >> >> On Nov 13, 2013, at 12:29 PM, Allred, Elizabeth wrote: >> >>> On further reading, I see... You're trying to find ids with "mixed messages," i.e., sometimes 0 sometimes 1. >>> >>> gen zero=1 if type==0 >>> gen one=1 if type==1 >>> sort id >>> collapse (sum) zero one, by(id) >>> l id if zero==1 & one==1 >>> >>> -----Original Message----- >>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael McCulloch >>> Sent: Wednesday, November 13, 2013 3:14 PM >>> To: statalist@hsphsun2.harvard.edu >>> Subject: st: identifying observations where multiple conditions are met >>> >>> Hello, >>> I have data of the structure: >>> id (range 1 to 300) >>> type (for each -id-, should equal only one of two values: 0 or 1). >>> >>> In manual inspection of the data, I see instances exist where, for the same -id-, >>> some records have type==0, and >>> other records have type==1. >>> >>> If I enter >>> . tab id if type==0 & type==1 >>> obviously "no observations" is returned. >>> >>> How would I write a command in which I can tabulate all -id- for which some observations exist where type==0, and others where type==1? (At data entry, -type- should have unique for each -id-.) >>> >>> >>> Best wishes, >>> Michael McCulloch >>> >>> -- >>> Pine Street Foundation, since 1989 >>> 124 Pine Street | San Anselmo | California | 94960-2674 >>> P: (415) 407-1357 | F: (206) 338-2391 | http://www.PineStreetFoundation.org >>> >>> >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>> * http://www.ats.ucla.edu/stat/stata/ >>> >>> * >>> * For searches and help try: >>> * http://www.stata.com/help.cgi?search >>> * http://www.stata.com/support/faqs/resources/statalist-faq/ >>> * http://www.ats.ucla.edu/stat/stata/ >> >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/faqs/resources/statalist-faq/ >> * http://www.ats.ucla.edu/stat/stata/ > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/