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

  DRUG TEST |
     TYPE-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,518       95.18       95.18
          1 |        361        3.61       98.79
          2 |         13        0.13       98.92
          3 |         18        0.18       99.10
          7 |          2        0.02       99.12
          8 |          5        0.05       99.17
          9 |         83        0.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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