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

Does ED use |
       pool |
   nursing? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |         98        0.98        0.98
    Unknown |      1,130       11.30       12.28
        Yes |      5,926       59.26       71.54
         No |      2,846       28.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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