Frequencies for first 10,000 rows of drinking variable in person dataset :

    ALCOHOL |
INVOLVEMENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,816       38.16       38.16
          1 |      1,781       17.81       55.97
          8 |      3,315       33.15       89.12
          9 |      1,088       10.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016