Frequencies for first 10,000 rows of phys variable in nhamcsopd2005 dataset :

  physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      1,790       17.90       17.90
        yes |      8,210       82.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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