Frequencies for first 10,000 rows of specr variable in namcs1999 dataset :

      physician specialty |
                   recode |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
  General/family practice |      1,729       17.29       17.29
        Internal medicine |        901        9.01       26.30
               Pediatrics |        526        5.26       31.56
          General surgery |        707        7.07       38.63
Obstetrics and gynecology |        464        4.64       43.27
       Orthopedic surgery |        431        4.31       47.58
  Cardiovascular diseases |        513        5.13       52.71
              Dermatology |        833        8.33       61.04
                  Urology |        354        3.54       64.58
               Psychiatry |      1,036       10.36       74.94
                Neurology |        440        4.40       79.34
            Ophthalmology |        681        6.81       86.15
           Otolaryngology |        474        4.74       90.89
        Other specialties |        911        9.11      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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