Frequencies for first 10,000 rows of toxscren variable in nhamcsed2012 dataset :

 Toxicology |
     screen |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,535       95.35       95.35
        Yes |        465        4.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016