Frequencies for first 10,000 rows of speccat variable in namcs2009 dataset :

    physician specialty |
      recode (3 groups) |      Freq.     Percent        Cum.
------------------------+-----------------------------------
 primary care specialty |      9,221       92.21       92.21
surgical care specialty |         94        0.94       93.15
 medical care specialty |        685        6.85      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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