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

  drug test |
  -type (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,264       92.64       92.64
          1 |        721        7.21       99.85
          2 |          8        0.08       99.93
          3 |          1        0.01       99.94
          6 |          1        0.01       99.95
          7 |          1        0.01       99.96
          8 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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