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


From   Shehzad Ali <drshehzad_ali@yahoo.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: total() returns zero if all missing in long-format data
Date   Tue, 30 Oct 2012 07:41:57 +0000 (GMT)

Thanks, Nick and Maarten. Spot on, as always. -total(), missing- works perfect.

Thanks
Shehzad

P.S. Sorry for the delay in replying - my email update was delayed.


----- Original Message -----
> From: Nick Cox <njcoxstata@gmail.com>
> To: statalist@hsphsun2.harvard.edu
> Cc: 
> Sent: Monday, 29 October 2012, 14:11
> Subject: Re: st: total() returns zero if all missing in long-format data
> 
> 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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