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Re: st: total() returns zero if all missing in long-format data


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: total() returns zero if all missing in long-format data
Date   Mon, 29 Oct 2012 14:11:39 +0000

Maarten is as usual completely correct.

There is some discussion of summing missings in

SJ-10-1 dm0047  . . . . . . . . . . . . . . . .  Stata tip 84: Summing missing
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
        Q1/10   SJ 10(1):157--159                                (no commands)
        tip concerning treatment of missing data when summing

Nick

On Mon, Oct 29, 2012 at 1:32 PM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Mon, Oct 29, 2012 at 2:19 PM, Shehzad Ali <drshehzad_ali@yahoo.com> wrote:
>> In long-format data structure (multiple obs per id), the total() function returns zero if all values of the variable for a particular id are missing. Can anyone suggest the best way to ensure that the total returns missing when all values are missing for a particular id?
>>
>> bysort id: egen total = total(var1)
>
> The answer is in the helpfile of -egen-.

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