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| From | Michael McCulloch <mm@pinestreetfoundation.org> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: RE: identifying observations where multiple conditions are met |
| Date | Wed, 13 Nov 2013 13:08:31 -0800 |
Thanks Sergiy for the simulation & code. I note that the command . tabulate id if flag will identify both the problem observations I want to drop (where for the same -id-, that -type- is not unique, there are observations of both kinds, type==0 and type==1), but also also ones in which for -id-, that -type- is in fact unique, but there is only ONE observation. 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 12:38 PM, Sergiy Radyakin wrote: > //------------------------------------------ > clear > set obs 100 > gen id=floor(_n/2) > gen type=floor(uniform()*2) > //------------------------------------------ > sort id > by id: egen flag=sd(type) > replace flag=1 if flag!=0 > > Best, Sergiy Radyakin > > > On Wed, Nov 13, 2013 at 3:24 PM, Allred, Elizabeth > <lizard@hsph.harvard.edu> wrote: >> Have you tried: >> >> tab id if type==0 | type==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/