Frequencies for drugres1 variable in person dataset :

  DRUG TEST |
  RESULTS-1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        669       62.12       62.12
          1 |        374       34.73       96.84
        117 |          1        0.09       96.94
        177 |          6        0.56       97.49
        187 |          1        0.09       97.59
        407 |         22        2.04       99.63
        695 |          4        0.37      100.00
------------+-----------------------------------
      Total |      1,077      100.00

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