Frequencies for first 10,000 rows of eimagee variable in nhamcsed2006 dataset :

   if yes, are |
    electronic |
        images |
     returned? |      Freq.     Percent        Cum.
---------------+-----------------------------------
           yes |      2,561       25.61       25.61
            no |        621        6.21       31.82
       unknown |        797        7.97       39.79
not applicable |      5,087       50.87       90.66
         blank |        934        9.34      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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