Frequencies for first 10,000 rows of epubhlth variable in namcs2009 dataset :

  practice has |
  computerized |
    system for |
 public health |
    reporting? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         67        0.67        0.67
       unknown |        640        6.40        7.07
           yes |      2,079       20.79       27.86
            no |      7,189       71.89       99.75
    turned off |         25        0.25      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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