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

DRUG STATUS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,581       65.81       65.81
          1 |          4        0.04       65.85
          2 |      3,302       33.02       98.87
          9 |        113        1.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016