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

  drug test |
  -type (1) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,294       62.94       62.94
          1 |      3,489       34.89       97.83
          2 |         47        0.47       98.30
          3 |          2        0.02       98.32
          6 |          3        0.03       98.35
          7 |         25        0.25       98.60
          8 |         36        0.36       98.96
          9 |        104        1.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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