Frequencies for first 10,000 rows of phys variable in nhamcsopd2011 dataset :

  Physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      2,198       21.98       21.98
        Yes |      7,802       78.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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