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

  drug test |
    -status |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,905       59.05       59.05
          1 |          1        0.01       59.06
          2 |      3,642       36.42       95.48
          8 |        432        4.32       99.80
          9 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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