Frequencies for first 10,000 rows of refothmd variable in nhamcsopd2009 dataset :

   refer to |
   other md |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      8,570       85.70       85.70
        yes |      1,430       14.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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