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

  drug test |
    -status |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,957       59.57       59.57
          1 |          1        0.01       59.58
          2 |      3,909       39.09       98.67
          8 |          5        0.05       98.72
          9 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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