Frequencies for a_alctes variable in per_aux dataset :

    Alcohol |
    Testing |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        493       33.18       33.18
          2 |        269       18.10       51.28
          3 |        716       48.18       99.46
          4 |          8        0.54      100.00
------------+-----------------------------------
      Total |      1,486      100.00

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