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
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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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