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

  DRUG TEST |
     TYPE-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,734       97.34       97.34
          1 |        116        1.16       98.50
          2 |         27        0.27       98.77
          3 |         25        0.25       99.02
          7 |          2        0.02       99.04
          8 |         95        0.95       99.99
          9 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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