Frequencies for speccat variable in namcsphys2005_2010 dataset :

  physician |
  specialty |
    recoded |
       into |
   primary, |
  surgical, |
    medical |
 categories |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,184       42.74       42.74
          2 |      1,960       26.31       69.06
          3 |      2,305       30.94      100.00
------------+-----------------------------------
      Total |      7,449      100.00

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