Re: st: gen & summation

[Philipp Rehm <philipp.rehm@gmx.de>]

You ask Stata to assign missing values whenever your variable select!=1, 
or when day1, day2, day3 are all missing.

So, I don't see the problem.

HTH,
Philipp

Ziad El-Khatib wrote:

> Hi
> very strange result is happening when i try to
>
>
> gen total=day1+day2+day3 if select==1
>
>
> STATA gives
> (1330 missing values generated)
>
> Although the above variables (day1,2,3) contain numeric values, any tips?
>
>
> Thank you and best regards
> ziad
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