Frequencies for first 10,000 rows of lft variable in nhamcsed2006 dataset :

      liver |
   function |
      tests |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,466       94.66       94.66
        yes |        534        5.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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