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

  Method of |
       Drug |
determinati |
      on by |
     police |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        176        1.76        1.76
          2 |        133        1.33        3.09
          3 |         87        0.87        3.96
          7 |         74        0.74        4.70
          8 |      9,530       95.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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