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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        173        1.73        1.73
          2 |         21        0.21        1.94
          3 |         11        0.11        2.05
          7 |         35        0.35        2.40
          8 |      9,760       97.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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