Frequencies for first 10,000 rows of ectoeo variable in nhamcsopd2009 dataset :

 does opd have |
  computerized |
    system for |
    orders for |
        tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        283        2.83        2.83
       unknown |        336        3.36        6.19
           yes |      5,106       51.06       57.25
            no |      4,275       42.75      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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