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

    ALCOHOL |
INVOLVEMENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,086       40.86       40.86
          1 |      1,158       11.58       52.44
          8 |      3,205       32.05       84.49
          9 |      1,551       15.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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