Frequencies for first 10,000 rows of phys variable in nhamcsopd2007 dataset :

  physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      2,135       21.35       21.35
        yes |      7,865       78.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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