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

        Are |
admitted ED |
   patients |
       ever |
  'boarded' |
   for more |
     than 2 |
   hours in |
  the ED or |
      obser |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |         57        0.57        0.57
    Unknown |        201        2.01        2.58
        Yes |      7,292       72.92       75.50
         No |      2,450       24.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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