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

  practice has |
  computerized |
system for pat |
   demographic |
         info? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |         37        0.37        0.37
       unknown |         31        0.31        0.68
           yes |      8,141       81.41       82.09
            no |      1,791       17.91      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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