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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        217        2.17        2.17
          2 |         10        0.10        2.27
          3 |         62        0.62        2.89
          7 |         52        0.52        3.41
          8 |      9,659       96.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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