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

    ALCOHOL |
INVOLVEMENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,059       40.59       40.59
          1 |      1,128       11.28       51.87
          8 |      3,497       34.97       86.84
          9 |      1,316       13.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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