Frequencies for first 10,000 rows of phys variable in nhamcsopd2006 dataset :

  physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      2,145       21.45       21.45
        Yes |      7,855       78.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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