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Re: st: FW: forvalues question...


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: FW: forvalues question...
Date   Fri, 8 Feb 2013 17:36:08 +0000

That's summing rowwise. I see no signal that that is what is wanted.

Since Stata 9 or thereabouts, -egen-'s -rowsum()- function has been undocumented in favour of -rowtotal()-, but it still works well.

Nick

On 8 Feb 2013, at 17:14, "Dudekula, Anwar" <dudekulaan@upmc.edu> wrote:

Hi Mike

Can you use egen(sumperyear): rowsum(var1-var5)

Thank you,
Yours Sincerely,
Anwar
________________________________________
From: owner-statalist@hsphsun2.harvard.edu [owner- statalist@hsphsun2.harvard.edu] on behalf of Nick Cox [njcoxstata@gmail.com]
Sent: Friday, February 08, 2013 9:36 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: FW: forvalues question...

Yes, that's better than my solution. I got hung up on how to do it
with -forvalues-, when a better answer is to do it directly.

Nick

On Fri, Feb 8, 2013 at 2:27 PM, Scott Merryman <scott.merryman@gmail.com > wrote:
On Fri, Feb 8, 2013 at 8:04 AM, Mahometa, Michael J
<michael.mahometa@ssc.utexas.edu> wrote:
All,

I've got a dataset that has multiple rows for one year, with several sequential variables. And, I'd like to sum what happens over the year (using something like collapse). I have 20 variables and the data looks like:

Year   var1  var2  var3  var4  var5 ....
1999   2     5     6     1     4
1999   4     1     5     2     5
1999   1     3     5     6     7
2000   6     5     1     3     8
2000   1     1     2     3     6
...

So the current "brute force" method is:
collapse (sum) var1_s=var1 var2_s=var2 ///
var3_s=var3 var4_s=var4, by(year)

But this seems in-elegant.

How about:

collapse (sum) var*, by(year)
rename var* =_s
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