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

  Drug Test |
  -Type (1) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,793       57.93       57.93
          1 |      3,257       32.57       90.50
          2 |         56        0.56       91.06
          3 |          6        0.06       91.12
          6 |        811        8.11       99.23
          7 |         20        0.20       99.43
          8 |         46        0.46       99.89
          9 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016