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

  DRUG TEST |
     TYPE-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,660       96.60       96.60
          1 |        197        1.97       98.57
          2 |         27        0.27       98.84
          3 |         44        0.44       99.28
          7 |          3        0.03       99.31
          8 |         39        0.39       99.70
          9 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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