Frequencies for first 10,000 rows of eimagee variable in nhamcsed2008 dataset :

   if yes, are |
    electronic |
        images |
     returned? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        176        1.76        1.76
       unknown |      1,590       15.90       17.66
not applicable |      1,120       11.20       28.86
           yes |      6,539       65.39       94.25
            no |        575        5.75      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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