Frequencies for first 10,000 rows of drugtst1 variable in person dataset :

  DRUG TEST |
     TYPE-1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,524       75.24       75.24
          1 |      1,378       13.78       89.02
          2 |        161        1.61       90.63
          3 |         83        0.83       91.46
          7 |         50        0.50       91.96
          8 |         16        0.16       92.12
          9 |        788        7.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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