Frequencies for drugtst3 variable in person dataset :

  DRUG TEST |
     TYPE-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,288      100.00      100.00
------------+-----------------------------------
      Total |      1,288      100.00

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