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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        171        1.71        1.71
          2 |         14        0.14        1.85
          3 |         29        0.29        2.14
          7 |         48        0.48        2.62
          8 |      9,738       97.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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