Frequencies for first 10,000 rows of emedres variable in nhamcsed2014 dataset :

       Does |
   hospital |
       have |
  Emergency |
   Medicine |
  residency |
   program? |      Freq.     Percent        Cum.
------------+-----------------------------------
    Unknown |        377        3.77        3.77
        Yes |      4,802       48.02       51.79
         No |      4,821       48.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017