Frequencies for first 10,000 rows of eimgres variable in namcs2006 dataset :

      does emr |
system include |
       imaging |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
           yes |      1,614       16.14       16.14
            no |      1,206       12.06       28.20
       unknown |        104        1.04       29.24
    turned off |         51        0.51       29.75
not applicable |      6,889       68.89       98.64
         blank |        136        1.36      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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