Frequencies for first 10,000 rows of ehxfu variable in namcs2007 dataset :

       if yes, |
       include |
       medical |
history/follow |
    -up notes? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        302        3.02        3.02
       unknown |        102        1.02        4.04
not applicable |      6,583       65.83       69.87
           yes |      2,678       26.78       96.65
            no |        335        3.35      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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