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

   if yes, are |
  out of range |
        levels |
  highlighted? |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |        531        5.31        5.31
not applicable |      2,520       25.20       30.51
           yes |      6,795       67.95       98.46
            no |        154        1.54      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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