Frequencies for first 10,000 rows of eresult variable in namcs2009 dataset :

  practice has |
  computerized |
    system for |
   viewing lab |
      results? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         37        0.37        0.37
       unknown |         44        0.44        0.81
           yes |      5,851       58.51       59.32
            no |      4,033       40.33       99.65
    turned off |         35        0.35      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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