Frequencies for first 10,000 rows of lft variable in nhamcsed2015 dataset :

      Liver |
   function |
      tests |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,527       95.27       95.27
        Yes |        473        4.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017