变量名不能是数字开头

  error . . . . . . . . . . . . . . . . . . . . . . . .  Return code 198
        invalid syntax
        option __________ incorrectly specified
        option __________ not allowed
        __________ invalid
        range invalid
        __________ invalid obs no
        invalid filename
        __________ invalid varname
        __________ invalid name
        multiple by's not allowed
        __________ found where number expected
        on or off required
        All items in this list indicate invalid syntax.  These errors
        are often, but not always, due to typographical errors.  Stata
        attempts to provide you with as much information as it can.
        Review the syntax diagram for the designated command.
         
        In giving the message "invalid syntax", Stata is not helpful.
        Errors in specifying expressions often result in this message.

我这个也不是数字开头，咋也不行哇