Frequencies for first 10,000 rows of f_alcol variable in natlterr2005 dataset :

Alcohol use |
          U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,812       68.12       68.12
          1 |      3,188       31.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015