Frequencies for first 10,000 rows of lft variable in nhamcsed2008 dataset :

      liver |
   function |
      tests |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,041       90.41       90.41
        yes |        959        9.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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