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

    Alcohol |
Involvement |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,490       74.90       74.90
          1 |      2,510       25.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016