Frequencies for first 10,000 rows of drugtst2 variable in person dataset :

  DRUG TEST |
     TYPE-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,693       96.93       96.93
          1 |        159        1.59       98.52
          2 |         29        0.29       98.81
          3 |         53        0.53       99.34
          7 |          4        0.04       99.38
          8 |         59        0.59       99.97
          9 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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