Frequencies for first 10,000 rows of lft variable in nhamcsed2011 dataset :

      Liver |
   function |
      tests |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      8,798       87.98       87.98
        Yes |      1,202       12.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016