Frequencies for first 10,000 rows of lft variable in nhamcsed2013 dataset :

      Liver |
   function |
      tests |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,156       91.56       91.56
        Yes |        844        8.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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