Frequencies for first 10,000 rows of alcohol variable in natl1989 dataset :

Alcohol Use |
     During |
  Pregnancy |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        231        2.31        2.31
          2 |      9,615       96.15       98.46
          9 |        154        1.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016