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st: RE: How to sum two whole rows by date and time


From   "Cohen, Elan" <cohened@upmc.edu>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: RE: How to sum two whole rows by date and time
Date   Wed, 3 Aug 2011 17:10:24 +0000

collapse (sum) x y d1 d2 d3 dup, by(date time)


> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] On Behalf Of Beatrice Crozza
> Sent: Wednesday, August 03, 2011 12:40
> To: statalist
> Subject: st: How to sum two whole rows by date and time
> 
> Dear All,
> 
> maybe it is an easy problem to solve, but I cannot find a way to sort it out!
> 
> I would like to sum the entries of two rows:
> 
> date              time       x        y    d1    d2 d3  dup
> 23/01/2008     9:05     99.8           1      .   .      1
> 23/01/2008     9:05         .       5    .      1   1     2
> 
> i would like to sum by date and time, in order to have:
> 
> date              time       x        y    d1    d2 d3  dup
> 23/01/2008     9:05       99.8      5    1     1   1     3
> 
> 
> It is not always the case that, for example, one row has the price, in
> other words there is not regularity, otherwise I could have used a
> time operator to replace the row with the previous one.
> 
> I also tried with collapse (sum) but i receive the error message that
> a variable cannot be both target and by() and I haven't found a
> command similar to egen rowtotal for summing columns.
> 
> Thank you very much for any help.
> 
> Bea
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