Frequencies for first 10,000 rows of ortho variable in nhamcsopd2007 dataset :

 orthopedic |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,699       96.99       96.99
        yes |        301        3.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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