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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        145        1.45        1.45
          2 |         23        0.23        1.68
          3 |         29        0.29        1.97
          7 |         62        0.62        2.59
          8 |      9,741       97.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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