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

 does opd have |
  computerized |
    system for |
 public health |
    reporting? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        427        4.27        4.27
       unknown |      1,502       15.02       19.29
           yes |      3,024       30.24       49.53
            no |      5,047       50.47      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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