Frequencies for first 10,000 rows of imbed variable in nhamcsed2012 dataset :

Does ED use |
  immediate |
   bedding? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |        152        1.52        1.52
    Unknown |      1,208       12.08       13.60
        Yes |      5,817       58.17       71.77
         No |      2,823       28.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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