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

  DRUG TEST |
     TYPE-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,318       93.18       93.18
          1 |        232        2.32       95.50
          2 |         26        0.26       95.76
          3 |         56        0.56       96.32
          7 |          5        0.05       96.37
          8 |         40        0.40       96.77
          9 |        323        3.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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