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

       DRUG |
DETERMINATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        257        2.57        2.57
          2 |        188        1.88        4.45
          3 |         20        0.20        4.65
          7 |         19        0.19        4.84
          8 |      9,516       95.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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