Frequencies for first 10,000 rows of ehxfue variable in nhamcsed2007 dataset :

  if yes, does |
    it include |
       medical |
history/follow |
    -up notes? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        103        1.03        1.03
       unknown |        157        1.57        2.60
not applicable |      3,651       36.51       39.11
           yes |      5,816       58.16       97.27
            no |        273        2.73      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016