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

  method of |
       drug |
determinati |
      on by |
     police |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        358        3.58        3.58
          2 |        138        1.38        4.96
          3 |         84        0.84        5.80
          7 |         87        0.87        6.67
          8 |      9,333       93.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016