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| From | "Allred, Elizabeth" <lizard@hsph.harvard.edu> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | st: RE: identifying observations where multiple conditions are met |
| Date | Wed, 13 Nov 2013 20:29:07 +0000 |
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/