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

  drug test |
  -type (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,119       91.19       91.19
          1 |        862        8.62       99.81
          2 |          5        0.05       99.86
          6 |          4        0.04       99.90
          7 |          2        0.02       99.92
          8 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016