Frequencies for first 10,000 rows of epnotes variable in namcs2007 dataset :

  practice has |
      computer |
    system for |
      clinical |
        notes? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |          9        0.09        0.09
       unknown |         99        0.99        1.08
           yes |      3,379       33.79       34.87
            no |      6,483       64.83       99.70
    turned off |         30        0.30      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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