Frequencies for first 10,000 rows of eimagee variable in nhamcsed2007 dataset :

   if yes, are |
    electronic |
        images |
     returned? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        103        1.03        1.03
       unknown |        948        9.48       10.51
not applicable |      2,008       20.08       30.59
           yes |      6,228       62.28       92.87
            no |        713        7.13      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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