Frequencies for first 10,000 rows of refothmd variable in nhamcsopd2010 dataset :

   refer to |
      other |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,640       86.40       86.40
        yes |      1,360       13.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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