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st: How to create sum of variables by time and space
From
"Ahmedov, Zafarbek" <[email protected]>
To
[email protected]
Subject
st: How to create sum of variables by time and space
Date
Wed, 8 Jun 2011 12:37:31 -0500 (CDT)
Howdy,
I'm using Stata 11. I have a data table with 5 variables (columns)and over 500,000 observations. Two of them are time (Year, Month) variables and one location (Location) variable. I am trying to get the sum of the other two variables (Tons, Number_of_Barges) by location and time.
I tried to sort the data and get the summary statistics, but it didn't produce the desired result. I typed the following codes:
sort location year month
by location year month: summarize(Tons Number_of_Barges)
The problem with this code is, it didn't give the totals. I would greatly appreciate if you can offer any help or advise.
Thanks.
Zafar
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