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

  drug test |
    -status |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,250       62.50       62.50
          1 |          5        0.05       62.55
          2 |      3,633       36.33       98.88
          9 |        112        1.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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