Frequencies for first 10,000 rows of speccat variable in namcs2013 dataset :

      Type of specialty |
     (Primary, Medical, |
              Surgical) |      Freq.     Percent        Cum.
------------------------+-----------------------------------
 Primary care specialty |      4,561       45.61       45.61
Surgical care specialty |      2,269       22.69       68.30
 Medical care specialty |      3,170       31.70      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017