re: st: Collapse with sum function and missing values: correction

["Airey, David C" <david.airey@Vanderbilt.Edu>]

.

Agreed.

> <>
> 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



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