Frequencies for first 10,000 rows of ectoeo variable in nhamcsopd2008 dataset :

 does opd have |
      computer |
    system for |
    orders for |
        tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        309        3.09        3.09
       unknown |        310        3.10        6.19
           yes |      6,213       62.13       68.32
            no |      3,063       30.63       98.95
    turned off |        105        1.05      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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