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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        244        2.44        2.44
          2 |        197        1.97        4.41
          3 |         12        0.12        4.53
          7 |         25        0.25        4.78
          8 |      9,522       95.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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