Re: st: sum command

[Richard Williams <Richard.A.Williams.5@ND.edu>]

At 09:52 PM 1/23/2006, Baoyan Cheng wrote:
> Hi, there,
>
> Does anyone know the correct command for doing sum in STATA?
>
> I need to add together seven variables to form one measure called 
> "anxiety." I could simply add all the seven variables together, but 
> STATA would drop any observation that misses one of the seven 
> variables. I want STATA to treat missing values as 0 if at least one 
> of the seven variables is not missing, and that's what the command 
> "sum" is supposed to do (I thought).
>
> I tried the following commands, but none of them worked:
>
> 1)egen anxi_sum=rsum (careopin, nervoppsex,nervsocial, nervpublic, 
> worrlaug, worrdrop, worrburd)
> 2)egen anxi_sum=sum (careopin, nervoppsex,nervsocial, nervpublic, 
> worrlaug, worrdrop, worrburd)
> 3)gen anxi_sum=sum (careopin, nervoppsex,nervsocial, nervpublic, 
> worrlaug, worrdrop, worrburd)
>
> The first was said to be "invalid syntax"; the second one "variables 
> in the parentheses are
> invalid names"; and the third one "sum not found."
There may be other problems, but at a minimum get rid of the spaces 
between the function and the parentheses and also replace the commas 
with spaces, e.g.

egen anxi_sum=rsum(careopin nervoppsex nervsocial nervpublic worrlaug 
worrdrop worrburd)


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Richard Williams, Notre Dame Dept of Sociology
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