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st: Seasons from Dates
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
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
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