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

  practice has |
  computerized |
    system for |
    orders for |
        tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         63        0.63        0.63
       unknown |         76        0.76        1.39
           yes |      4,493       44.93       46.32
            no |      5,287       52.87       99.19
    turned off |         81        0.81      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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