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| From | Nick Cox <njcoxstata@gmail.com> |
| To | "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |
| Subject | Re: st: RE: date calculation |
| Date | Mon, 10 Mar 2014 20:00:54 +0000 |
I see the similarity now! If one date is monthly and the other daily, convert the daily to monthly and calculate the difference in months. Completed years are then floor(months/12). More precision is likely to be spurious. Nick njcoxstata@gmail.com On 10 March 2014 19:58, Nick Cox <njcoxstata@gmail.com> wrote: > That question looks different to me. > > Nick > njcoxstata@gmail.com > > > On 10 March 2014 19:52, Joe Canner <jcanner1@jhmi.edu> wrote: >> Matthew, >> >> I think you asked more or less the same question a few months ago: http://www.stata.com/statalist/archive/2013-10/msg00662.html >> >> At any rate, the answers given at that time should help answer this question. >> >> Regards, >> Joe Canner >> Johns Hopkins University School of Medicine >> >> -----Original Message----- >> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of DeMichele, Matthew >> Sent: Monday, March 10, 2014 3:39 PM >> To: statalist@hsphsun2.harvard.edu >> Subject: st: date calculation >> >> I have two date variables arranged as YYYYMM and YYYYYMMDD. The first >> variable is date of birth and the second is date of admission to >> treatment. I am trying to calculate age_at_admission, but am running >> into trouble. Is this a possible calculation since Stata calculates >> dates as days since 1,1,1960? >> * * 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/