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

  practice has |
      computer |
system for pat |
   demographic |
         info? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         92        0.92        0.92
       unknown |        107        1.07        1.99
           yes |      7,889       78.89       80.88
            no |      1,912       19.12      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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