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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        339        3.39        3.39
          2 |        149        1.49        4.88
          3 |         24        0.24        5.12
          7 |         52        0.52        5.64
          8 |      9,436       94.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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