Generate variable containing sum across variables
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          ^genvsum^ varlist [^if^ exp] [^in^ range], ^generate(^newvar^)^

adds newvar to your data containing the sum, for each observation, of the
variables in varlist.  The calculated sum excludes missing values, if any.

The ^generate()^ "option" is not optional.

Example:

        . ^genvsum x1-x3, gen(avg)^

creates the variable ^avg^ containing the sum of ^x1^ through ^x3^ for each
observation.  This is a minor modification of the STATA-supplied program,
genvmean.