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

 does opd have |
      computer |
    system for |
    orders for |
prescriptions? |      Freq.     Percent        Cum.
---------------+-----------------------------------
       unknown |        241        2.41        2.41
           yes |      3,920       39.20       41.61
            no |      5,839       58.39      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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