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

  DRUG TEST |
     TYPE-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,579       95.79       95.79
          1 |        191        1.91       97.70
          2 |         57        0.57       98.27
          3 |         56        0.56       98.83
          7 |          3        0.03       98.86
          8 |        114        1.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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