Frequencies for first 10,000 rows of dr_drink variable in vehicle dataset :

     driver |
   drinking |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,945       79.45       79.45
          1 |      2,055       20.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016