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st: RE: summing variables


From   "Joseph McCrary" <joe.mccrary@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: summing variables
Date   Thu, 26 Jul 2007 17:57:26 -0400

Note that the answers provided by Maarten and Ricardo may provide different
results. You'll want to be careful about missing data. -egen, rowtotal-
treats missing values as 0, while the solution provided by Maarten does not.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of P chrisman
Sent: Thursday, July 26, 2007 4:09 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: summing variables

Dear List,

I need to find the total mg of a treatment received for each subject. I 
have mg of treatment drug as variables mg_1 for the first dose received 
through mg_108 for the last dose received. I would normally just create 
a variable, e.g. gen totalmg= mg_1 + mg_2 to find the total, but since I 
have 108 doses to sum, I am wondering if there is a more efficient way 
to create the totalmg?

Thanks,
pc
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