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

   if yes, are |
    electronic |
        images |
     returned? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        518        5.18        5.18
not applicable |      2,184       21.84       27.02
           yes |      6,534       65.34       92.36
            no |        764        7.64      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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