st: Columns of binary variable

[john metcalfe <johnzmetcalfe@gmail.com>]

> Dear Statalist,
> I have 11 columns of binary variables as per the example below. This may be a very straightforward question, but is there a way to generate a new variable that represents the number of 1's in each row for each individual?
> Many thanks,
> John
>
>
>
>   1.     0     0    0     0     0     .     0     0    0     0     0
>   2.     1     1    1     0     0     0     0     0    0     0     0
>   3.     1     1    1     0     0     0     0     0    0     0     .
>   4.     0     1    1     .     .     .     .     .    .     .     .
>   5.     1     1    1     .     1     0     1     0    1     .     .
>   6.     1     0    0     .     .     .     .     .    .     .     .
>   7.     0     1    1     0     0     .     0     0    0     0     0
>   8.     0     1    0     0     0     .     0     0    0     0     0
>   9.     0     1    1     0     .     0     0     0    0     0     0
>  10.     0     0    0     .     .     .     .     .    .     .     .
>  11.     0     0    0     0     0     0     0     0    0     0     0
>  12.     0     1    1     .     0     0     0     0    0     .     .
>  13.     0     1    1     0     0     0     0     0    0     0     0
>  14.     0     1    1     0     0     0     0     0    0     0     0
>  15.     0     0    0     1     .     0     0     0    .     0     .
>  16.     0     0    0     .     .     .     .     .    .     .     .
>  17.     1     1    1     0     0     0     0     1    0     .     .
>  18.     0     0    1     0     0     0     0     0    0     0     0
>  19.     0     0    1     0     0     0     0     0    0     .     .
>  20.     1     0    0     0     .     .     .     0    0     .     0
>  21.     0     0    1     1     1     .     1     0    1     0     0
>  22.     .     1    1     0     1     0     0     0    1     0     0
>  23.     0     0    1     0     0     0     0     0    1     .     .
>  24.     0     1    0     0     0     .     0     0    0     0     0
>  25.     0     0    0     1     0     0     0     0    0     1     1
>  26.     0     0    0     .     .     .     .     .    .     .     .
>  27.     0     0    1     1     0     0     0     0    0     0     0
>  28.     0     0    0     0     1     0     0     0    0     0     0
>  29.     .     1    0     0     0     0     0     0    0     0     0
>  30.     1     0    0     0     0     0     0     0    0     0     0
>  31.     0     1    1     0     0     0     0     0    0     0     0
>  32.     1     1    1     1     0     1     0     1    1     0     0
>  33.     1     1    1     0     0     0     0     0    0     0     0
>  34.     0     0    0     .     .     .     .     .    .     .     .
>  35.     0     0    0     .     .     .     .     .    .     .     .
>  36.     0     1    1     0     1     0     1     0    1     1     1
>  37.     0     0    1     0     .     .     0     .    .     0     .
>
>

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