Frequencies for first 10,000 rows of board variable in nhamcsed2011 dataset :

        Are |
admitted ED |
   patients |
       ever |
  'boarded' |
   for more |
     than 2 |
   hours in |
  the ED or |
      obs u |      Freq.     Percent        Cum.
------------+-----------------------------------
    Unknown |         78        0.78        0.78
        Yes |      7,517       75.17       75.95
         No |      2,405       24.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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