Frequencies for first 10,000 rows of specr variable in namcs1996 dataset :

      physician specialty |
                   recode |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
  General/family practice |      2,341       23.41       23.41
        Internal medicine |      1,468       14.68       38.09
               Pediatrics |        865        8.65       46.74
          General surgery |        470        4.70       51.44
Obstetrics and gynecology |        437        4.37       55.81
       Orthopedic surgery |        453        4.53       60.34
  Cardiovascular diseases |        560        5.60       65.94
              Dermatology |        737        7.37       73.31
                  Urology |        223        2.23       75.54
               Psychiatry |        430        4.30       79.84
                Neurology |        351        3.51       83.35
            Ophthalmology |        365        3.65       87.00
           Otolaryngology |        392        3.92       90.92
        Other specialties |        908        9.08      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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