Frequencies for first 10,000 rows of attphys variable in nhamcsed2007 dataset :

         ed |
  attending |
  physician |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      1,119       11.19       11.19
        yes |      8,881       88.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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