Frequencies for first 10,000 rows of emedres variable in nhamcsed2015 dataset :

       Does |
   hospital |
    have an |
  Emergency |
   Medicine |
  residency |
   program? |      Freq.     Percent        Cum.
------------+-----------------------------------
    Unknown |        699        6.99        6.99
        Yes |      3,597       35.97       42.96
         No |      5,704       57.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017