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Re: st: summation of values within one column in a panel dataset
From
John Ataguba <[email protected]>
To
[email protected]
Subject
Re: st: summation of values within one column in a panel dataset
Date
Sun, 1 Aug 2010 08:11:55 +0000 (GMT)
Try
egen profit2=sum(profit), by(date)
Jon
________________________________
From: "[email protected]" <[email protected]>
To: [email protected]
Sent: Sun, 1 August, 2010 6:46:34
Subject: st: summation of values within one column in a panel dataset
I have a panel dataset and I wonder if it is possible to generate in Stata a
new variable that is the sum of observations for a variable for two of my
panels only (ie it is a summation of values within one column).
example: my panels are companies A,B,C.... and I have quarterly observations on
profits, revenues, etc.
Date company profits
comp profit date
A 120 2000
A 320 2001
B 102 2000
B 101 2001
C 156 2000
C 136 2001
Since company A and B merged in 1999, I need to use the sum of their profits for
my analysis in years 2000 and 2001. So I need to build a new variable A+B:
comp profit date
A+B 122 2000
A+B 421 2001
Is there a command for panel dataset in Stata that allows me to do such data
manipulation (panels are unbalanced, btw)? Unfortunately, I couldn't find any
information in the manuals and on internet. Many thanks in advance!
Best regards,
Radovan
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