Frequencies for first 10,000 rows of ectoeo variable in nhamcsopd2006 dataset :

      does emr |
system include |
  computerized |
    orders for |
        tests? |      Freq.     Percent        Cum.
---------------+-----------------------------------
           Yes |      2,404       24.04       24.04
            No |      1,517       15.17       39.21
       Unknown |        349        3.49       42.70
Not applicable |      5,529       55.29       97.99
         Blank |        201        2.01      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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