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

      does emr |
system include |
      clinical |
        notes? |      Freq.     Percent        Cum.
---------------+-----------------------------------
           yes |      3,901       39.01       39.01
            no |      1,119       11.19       50.20
       unknown |        383        3.83       54.03
not applicable |      4,164       41.64       95.67
         blank |        433        4.33      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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