Frequencies for first 10,000 rows of refered variable in namcs2007 dataset :

   refer to |
  emergency |
 department |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,974       99.74       99.74
        yes |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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