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

    ALCOHOL |
INVOLVEMENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,144       41.44       41.44
          1 |      1,192       11.92       53.36
          8 |      3,117       31.17       84.53
          9 |      1,547       15.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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