Frequencies for first 10,000 rows of speccat variable in namcs2012 dataset :

      Type of specialty |
     (Primary, Medical, |
              Surgical) |      Freq.     Percent        Cum.
------------------------+-----------------------------------
 Primary care specialty |      4,547       45.47       45.47
Surgical care specialty |      2,107       21.07       66.54
 Medical care specialty |      3,346       33.46      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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