Frequencies for first 10,000 rows of cast variable in nhamcsed2007 dataset :

       cast |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,944       99.44       99.44
        yes |         56        0.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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