# RE: st: detecting a complete data set

 From Nick Cox To "'statalist@hsphsun2.harvard.edu'" Subject RE: st: detecting a complete data set Date Tue, 16 Nov 2010 14:13:04 +0000

```"Does this mean...?"

No, it does not. A little experiment would show the difference, but in any case:

totmis == 0 evaluates as 1 or 0, according to whether it is the case that totmis == 0. Even if -totmis- were missing, it is then still not 0 and the result would still be 0.

1 if totmis == 0 evaluates as 1 or missing.  If -totmis- is not 0, Stata has no instructions on what to do, shrugs its shoulders and returns missing.

For more detail:

FAQ     . . . . . . . . . . . . . . . . . . . . . . .  True and false in Stata
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
2/03    What is true and false in Stata?
http://www.stata.com/support/faqs/data/trueorfalse.html

Nick
n.j.cox@durham.ac.uk

Seems to work. The result makes sense. I assume that if complete takes the value 0 that there are missing data, and if it takes the value 1 then the data are complete.
I am unsure about the grammer of "gen byte complete = totmis == 0"  Does this mean "generate complete = 1 IF totmis == 0"

On 2010-11-16, at 6:44 AM, Maarten buis wrote:

>> I want to detect the ID that has no data missing for ALL Levels
>> within that ID.  In this case ID 2 fits the bill, ID 1 has data
>> missing in levels 2 and 3
>
> *---------- begin example -------------
> drop _all
> input id level a b c d
> 1  1  1  1  1  1
> 1  2  1  0  .  0
> 1  3  .  1  0  .
> 1  4  1  0  1  1
> 2  1  1  0  1  1
> 2  2  0  0  0  1
> 2  3  0  1  1  1
> 2  4  1  1  1  1
> end
> gen byte mis = missing(a, b, c, d)
> bys id : egen int totmis = total(mis)
> gen byte complete = totmis == 0
> drop mis totmis
> list , sepby(id)
> *------------ end example ------------
> (For more on examples I sent to the Statalist see:
> http://www.maartenbuis.nl/example_faq )
>

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