Frequencies for first 10,000 rows of specr variable in namcs1994 dataset :

      physician specialty |
                   recode |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
  General/family practice |      4,946       49.46       49.46
        Internal medicine |      3,031       30.31       79.77
               Pediatrics |        901        9.01       88.78
          General surgery |        104        1.04       89.82
Obstetrics and gynecology |        128        1.28       91.10
       Orthopedic surgery |        104        1.04       92.14
  Cardiovascular diseases |         15        0.15       92.29
              Dermatology |         55        0.55       92.84
                  Urology |         34        0.34       93.18
               Psychiatry |        126        1.26       94.44
                Neurology |         80        0.80       95.24
            Ophthalmology |        113        1.13       96.37
        Other specialties |        363        3.63      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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