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Re: st: egen rowtotal


From   Nikolaos Pandis <npandis@yahoo.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: egen rowtotal
Date   Sun, 15 Jul 2012 12:43:38 -0700 (PDT)

Thank you all for your help
 
I ended up using the following:
**************************************
foreach myvar of varlist  structured- reg_num{
  recode `myvar' 99=0 
}
egen sum = rowtotal(structured- reg_num )
********************************************
the results make sense (the value of zero is not a problem as I am calculating a score from the sum of 1s, 2s and 3s)


From: Nick Cox <njcoxstata@gmail.com>
To: statalist@hsphsun2.harvard.edu 
Sent: Sunday, July 15, 2012 8:48 PM
Subject: Re: st: egen rowtotal

I think that if you choose the -egen- turning then the road ahead is
blocked, short of an enormously complicated -if- condition. But it  is
easy enough to work this out from first principles.

gen sum = 0

qui foreach v of var structured-reg_num {
    replace sum = sum + `v' if inlist(`v', 1, 2, 3)
}

replace sum = . if sum == 0

For a more systematic discussion, see

SJ-9-1  pr0046  . . . . . . . . . . . . . . . . . . .  Speaking Stata: Rowwise
        (help rowsort, rowranks if installed) . . . . . . . . . . .  N. J. Cox
        Q1/09  SJ 9(1):137--157
        shows how to exploit functions, egen functions, and Mata
        for working rowwise; rowsort and rowranks are introduced


Nick

On Sun, Jul 15, 2012 at 6:08 PM, Nikolaos Pandis <npandis@yahoo.com> wrote:

> I am using the following command to get a row total for 16 variables:
>
> egen sum = rowtotal(structured- reg_num )
>
> the possible values per variable are 1, 2, 3 or 99  and I would like the row total by adding only the 1s, the 2s and the 3s and to excluded the 99s.
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