Frequencies for first 10,000 rows of epubhlth variable in namcs2007 dataset :

  practice has |
      computer |
    system for |
 public health |
    reporting? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         90        0.90        0.90
       unknown |        435        4.35        5.25
           yes |      1,875       18.75       24.00
            no |      7,572       75.72       99.72
    turned off |         28        0.28      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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