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Re: st: egen rowtotal


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: egen rowtotal
Date   Sun, 15 Jul 2012 14:37:36 -0400

Another approach is to convert the 99's to missing values, which they are, before running -egen rowtotal-. This modifies the original data, but in many studies would be an acceptable, even desirable, step in data editing.

****************************************
mvdecode structured-reg_num, mvdecode(99)
****************************************

Steve
sjsamuels@gmail.com



On Jul 15, 2012, at 1:48 PM, Nick Cox wrote:

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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