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

 does opd have |
  computerized |
    system for |
    orders for |
prescriptions? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        168        1.68        1.68
       unknown |        336        3.36        5.04
           yes |      4,261       42.61       47.65
            no |      5,235       52.35      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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