Frequencies for first 10,000 rows of epubhlth variable in namcs2008 dataset :

  practice has |
      computer |
    system for |
 public health |
    reporting? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        164        1.64        1.64
       unknown |        678        6.78        8.42
           yes |      1,848       18.48       26.90
            no |      7,258       72.58       99.48
    turned off |         52        0.52      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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