Frequencies for first 10,000 rows of refothmd variable in nhamcsopd2006 dataset :

   refer to |
   other md |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,133       91.33       91.33
        Yes |        867        8.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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