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

  drug test |
  -type (1) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,958       59.58       59.58
          1 |      3,825       38.25       97.83
          2 |         28        0.28       98.11
          3 |          4        0.04       98.15
          6 |         20        0.20       98.35
          7 |          8        0.08       98.43
          8 |         29        0.29       98.72
          9 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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