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st: Seasons from Dates


From   "Thomas Speidel" <thomassp@cancerboard.ab.ca>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Seasons from Dates
Date   Mon, 28 Nov 2005 10:19:48 -0700

Dear Statalisters:

I am attempting to create a "season" variable based on a date variable.
The solstice start dates are Dec-21, Mar-21, Jun-21 and Sep-22 for
Winter(1), Spring(2), Summer(3) and Autumn(4) respectively.  I have
tried to accomplish this using a rather long series of logical operators
such as:

gen month=month(date)
gen day=day(date)
gen season=1 if (month>=12 & day>=21) | (month>=1 & (month<=3 & day<20))

...

However, this code is not correct as it excludes all days>=20.
Rather than adding more logical operators to condition upon the dates, I
was wondering if anyone has a suggestion for a cleaner, more elegant
code.

Thanks,
Thomas


--
Thomas Speidel
Statistical Associate
Clinical Trials Unit
Tom Baker Cancer Centre
1331 - 29th Street N.W.
Calgary, AB, T2N 4N4

Tel. (403) 521-3370
Email: thomassp@cancerboard.ab.ca


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