Frequencies for first 10,000 rows of eimageo variable in nhamcsopd2006 dataset :

   if yes, are |
    electronic |
        images |
     returned? |      Freq.     Percent        Cum.
---------------+-----------------------------------
           Yes |      1,870       18.70       18.70
            No |        200        2.00       20.70
       Unknown |        859        8.59       29.29
Not applicable |      6,445       64.45       93.74
         Blank |        626        6.26      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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