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| From | Sergiy Radyakin <serjradyakin@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 16:38:47 -0500 |
On Wed, Nov 13, 2013 at 4:08 PM, Michael McCulloch <mm@pinestreetfoundation.org> wrote: > 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. If singleton observations are acceptable for your algorithm, then modification can be: replace flag=1 if flag!=0 & !missing(flag) tab id if flag==1 Best, Sergiy > > > 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/ * * 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/