st: generating houshold size

[Leonie Fresenius <leonie.fresenius@googlemail.com>]

Dear all,
I have a problem that I don't get my mind around even though it is  
probablly not even complicated.

What I want to generate is household income weighted by the number of  
persons in the household, but I don't have a variable 'household size'  
included in my dataset. What I have is  information on each houshold  
member from a household grid. This means I have a seperate variable  
for each household member.

My question is, therefore, if there is a stata command to sum up the  
number of household members over these variables?

Thanks for any suggestions!
Leonie
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