Frequencies for first 10,000 rows of specr variable in namcs1998 dataset :

      physician specialty |
                   recode |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
  General/family practice |      3,628       36.28       36.28
        Internal medicine |      2,226       22.26       58.54
               Pediatrics |      2,167       21.67       80.21
          General surgery |      1,182       11.82       92.03
Obstetrics and gynecology |        345        3.45       95.48
       Orthopedic surgery |         84        0.84       96.32
  Cardiovascular diseases |         17        0.17       96.49
              Dermatology |         14        0.14       96.63
                  Urology |         24        0.24       96.87
               Psychiatry |         25        0.25       97.12
                Neurology |         30        0.30       97.42
            Ophthalmology |         67        0.67       98.09
        Other specialties |        191        1.91      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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