Frequencies for first 10,000 rows of ehxfuo variable in nhamcsopd2009 dataset :

  if yes, does |
    it include |
       medical |
history/follow |
    -up notes? |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |         95        0.95        0.95
not applicable |      4,023       40.23       41.18
           yes |      5,799       57.99       99.17
            no |         83        0.83      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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