Frequencies for first 10,000 rows of eresult variable in namcs2008 dataset :

  practice has |
      computer |
    system for |
   viewing lab |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         25        0.25        0.25
       unknown |         34        0.34        0.59
           yes |      6,151       61.51       62.10
            no |      3,758       37.58       99.68
    turned off |         32        0.32      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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