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

      Drunk |
     Driver |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,845       78.45       78.45
          1 |      2,059       20.59       99.04
          9 |         96        0.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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