Frequencies for first 10,000 rows of lft variable in nhamcsed2009 dataset :

      liver |
   function |
      tests |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,997       89.97       89.97
          1 |      1,003       10.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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