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

  Drug Test |
  -Type (2) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,220       92.20       92.20
          1 |        533        5.33       97.53
          2 |         51        0.51       98.04
          3 |         12        0.12       98.16
          6 |        156        1.56       99.72
          8 |          1        0.01       99.73
          9 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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