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

  drug test |
  -type (1) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,684       56.84       56.84
          1 |      2,873       28.73       85.57
          2 |         22        0.22       85.79
          3 |          5        0.05       85.84
          6 |      1,300       13.00       98.84
          7 |          3        0.03       98.87
          8 |         33        0.33       99.20
          9 |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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