Frequencies for first 10,000 rows of imbed variable in nhamcsed2013 dataset :

Does ED use |
  immediate |
   bedding? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |         98        0.98        0.98
    Unknown |        977        9.77       10.75
        Yes |      6,524       65.24       75.99
         No |      2,401       24.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016