Frequencies for first 10,000 rows of staffmd variable in nhamcsed2001 dataset :

      staff |
  physician |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        971        9.71        9.71
          1 |      9,029       90.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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