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

Does ED use |
       pool |
   nursing? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |        152        1.52        1.52
    Unknown |        710        7.10        8.62
        Yes |      5,183       51.83       60.45
         No |      3,955       39.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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