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st: Seasons from Dates

From   "Thomas Speidel" <>
Subject   st: Seasons from Dates
Date   Mon, 28 Nov 2005 18:12:16 +0000

Dear Statalisters:

Apologies if this messages will be posted twice, but I'm having difficulties
posting today from my work account.

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.


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