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Sorry, misinterpreted Michael's grouse in the last message. I agree that the _sum_ of x should be missing, as should all other descriptive stats except the -count-. The -count- of non-missing values is zero, but their -sum- is surely missing --- as it would be reported by -tabstat-.
Kit
Kit Baum | Boston College Economics & DIW Berlin | http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html
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