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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        200        2.00        2.00
          2 |        157        1.57        3.57
          3 |         17        0.17        3.74
          7 |         19        0.19        3.93
          8 |      9,607       96.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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