Frequencies for first 10,000 rows of toxscren variable in nhamcsed2014 dataset :

 Toxicology |
     screen |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,691       96.91       96.91
        Yes |        309        3.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017