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

  drug test |
    -status |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,290       62.90       62.90
          1 |          4        0.04       62.94
          2 |      3,600       36.00       98.94
          8 |          2        0.02       98.96
          9 |        104        1.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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