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

  practice has |
      computer |
    system for |
   viewing lab |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         96        0.96        0.96
       unknown |         32        0.32        1.28
           yes |      5,079       50.79       52.07
            no |      4,793       47.93      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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