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Re: st: Perplexed by the SUM function


From   Simon Moore <simoncmoore@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Perplexed by the SUM function
Date   Mon, 16 Mar 2009 22:16:13 +0000

Hi Lena,

Try

egen gh_raw = rowtotal(gh1 gh2 gh3 gh4 gh5)

Simon


Lena Cuisina wrote:
> I have a very basic question.  Iâ??m adding up responses to 5 questions.  Some of the questions have missing data.  This is what I donâ??t want to do, because I don't want to lose the 23 observations:
>
> . gen gh_raw = gh1 + gh2 + gh3 + gh4 + gh5
> (23 missing values generated)
>
> . gen gh_avg = gh_raw/5
> (23 missing values generated)
>
> I want to use whatever data Iâ??ve got from the other questions in calculating the sum -- ie, Iâ??d like to great the missing as zero, not missing.  So I tried the sum function:
>
> gen gh_raw1 = sum(gh1+gh2+gh3+gh4+gh5)
>
> gen gh_avg1 = gh_raw1/5
>
> All 5 questions have the same 5-category ordinal response scale thatâ??s coded 0, 25, 50, 75, 100.  So the average of the 5 responses are within the 0 to 100 range.  Unfortunately, the command I've written with the sum function gives me a set of average scores with a maximum of 18,800.  Itâ??s crazy.
>
> I have no idea what Iâ??m doing wrong, because Iâ??m pretty new to Stata.  Sorry for such a basic question.
>
> Lena
>
>
>
>       
>
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