Frequencies for first 10,000 rows of ehxfuo variable in nhamcsopd2007 dataset :

  if yes, does |
    it include |
       medical |
history/follow |
    -up notes? |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |        806        8.06        8.06
not applicable |      4,894       48.94       57.00
           yes |      4,125       41.25       98.25
            no |        175        1.75      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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