OK. But this is (in practice) equivalent
to a part of my posting you do not copy
here.
Nick
[email protected]
> -----Original Message-----
> From: Morten Andersen
> [mailto:[email protected]]On
> Behalf Of Morten Andersen
> Sent: 15 January 2004 22:41
> To: [email protected]
> Subject: RE: st: leap years
>
>
> At 06:30 PM 1/15/2004 +0000, Nick Cox wrote:
> >2004 is a leap year. This raises a small Stata problem,
> >how to determine if a year is a leap year using Stata
> >syntax.
> >
> >[...]
> >
> >In Stata: suppose -year- is a variable. An indicator
> >1 for leap year and 0 otherwise is then
> >given by
> >
> >(mod(year,4) == 0 & mod(year,100) != 0) | mod(year,400) == 0
> >
> >as -mod(,)- provides the remainder left over from division.
> >
> >The nested -cond()- solution, to please David Kantor, is
> >
> > cond(mod(year,400) == 0, 1,
> > cond(mod(year,100) == 0, 0,
> > cond(mod(year,4) == 0, 1,
> > 0)))
> >
> >[...]
>
> What about
>
> mdy(2,29,year) != .
>
> ?
>
> Regards,
>
> Morten Andersen
>
> ------------------------------------------------------------
> ----------------
> Morten Andersen, MD, PhD Research Unit of
> General Practice
> Senior Researcher University of
> Southern Denmark
> Phone +45 6550 3791 Winsloewparken 19
> Fax +45 6591 6089 DK-5000 Odense C
> E-mail [email protected] Denmark
> ------------------------------------------------------------
> ----------------
>
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