Frequencies for first 10,000 rows of speccat variable in namcs2007 dataset :

    physician specialty |
      recode (3 groups) |      Freq.     Percent        Cum.
------------------------+-----------------------------------
 primary care specialty |      8,943       89.43       89.43
surgical care specialty |        326        3.26       92.69
 medical care specialty |        731        7.31      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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