Frequencies for first 10,000 rows of speccat variable in namcs2005 dataset :

    physician specialty |
  recoded into 3 groups |      Freq.     Percent        Cum.
------------------------+-----------------------------------
 Primary care specialty |      8,665       86.65       86.65
Surgical care specialty |        779        7.79       94.44
 Medical care specialty |        556        5.56      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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