Frequencies for first 10,000 rows of physasst variable in namcs2007 dataset :

  physician |
  assistant |
       seen |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,725       97.25       97.25
        yes |        275        2.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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