Frequencies for first 10,000 rows of alcohol variable in natlterr2003 dataset :

Alcohol Use |
         U  |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         20        0.20        0.20
          2 |      9,980       99.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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