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

      does emr |
system include |
       imaging |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
           yes |      4,201       42.01       42.01
            no |        436        4.36       46.37
       unknown |        487        4.87       51.24
not applicable |      4,164       41.64       92.88
         blank |        712        7.12      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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