Frequencies for first 10,000 rows of ectoeo variable in nhamcsopd2007 dataset :

 does opd have |
      computer |
    system for |
    orders for |
        tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        322        3.22        3.22
       unknown |        160        1.60        4.82
           yes |      5,337       53.37       58.19
            no |      4,181       41.81      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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