Frequencies for first 10,000 rows of specr variable in namcs2006 dataset :

      physician specialty |
   recoded into 15 groups |      Freq.     Percent        Cum.
--------------------------+-----------------------------------
  general/family practice |      4,764       47.64       47.64
        internal medicine |      1,746       17.46       65.10
               pediatrics |      2,041       20.41       85.51
          general surgery |        600        6.00       91.51
obstetrics and gynecology |        153        1.53       93.04
       orthopedic surgery |        104        1.04       94.08
  cardiovascular diseases |         70        0.70       94.78
              dermatology |         36        0.36       95.14
                  urology |         30        0.30       95.44
               psychiatry |         13        0.13       95.57
                neurology |         17        0.17       95.74
            ophthalmology |         38        0.38       96.12
        other specialties |        355        3.55       99.67
                 oncology |         33        0.33      100.00
--------------------------+-----------------------------------
                    Total |     10,000      100.00

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