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RE: st: SUM question


From   "Yamamoto, Satomi" <syamamot@ad.uiuc.edu>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: SUM question
Date   Wed, 14 May 2008 23:31:44 -0500

Hello,

Thank you very much for the prompt reply.
I think  egen newvar = rowtotal(var1 var2) is equivalent to replacing missing values with 0(zero).

The SUM function in SPSS adds cases in the variable where at least one observation is valid:

Var 1   Var2
1        4
3        5
4        5
5        8
.        5
.        .

When  compute newvar= sum(var1, var2). is used, there will be 1 missing case.
When compute newvar= var1+var2. is used, there are 2 missing cases.

Do you have any ideas? It would be great if I could get help on this.

Sincerely,
Satomi


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Richard Williams
Sent: Wednesday, May 14, 2008 11:47 PM
To: statalist@hsphsun2.harvard.edu; statalist@hsphsun2.harvard.edu
Subject: Re: st: SUM question

At 10:29 PM 5/14/2008, Yamamoto, Satomi wrote:
>Hello,
>
>I'm wondering if anybody knows the Stata command that is equivalent to
>the following SPSS command:
>
>compute newvar= sum(var1, var2).
>exe.
>
>The SUM function in SPSS allows you to keep cases with missing values
>instaead of droppoing them. It's one way of  preventing listwise
>deletion. It would be great if I can get help with this.
>
>Sincerely,
>Satomi

egen newvar = rowtotal(var1 var2)


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
WWW:    http://www.nd.edu/~rwilliam

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