Frequencies for drugres1 variable in person dataset :

  DRUG TEST |
  RESULTS-1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        826       64.13       64.13
          1 |        406       31.52       95.65
        177 |          5        0.39       96.04
        187 |          1        0.08       96.12
        407 |         34        2.64       98.76
        695 |         16        1.24      100.00
------------+-----------------------------------
      Total |      1,288      100.00

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