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

  drug test |
  -type (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,259       92.59       92.59
          1 |        710        7.10       99.69
          2 |         14        0.14       99.83
          3 |          2        0.02       99.85
          7 |          7        0.07       99.92
          8 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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