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: [email protected] [mailto:[email protected]] On Behalf Of Richard Williams
Sent: Wednesday, May 14, 2008 11:47 PM
To: [email protected]; [email protected]
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: [email protected]
WWW: http://www.nd.edu/~rwilliam
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