Frequencies for first 10,000 rows of region variable in namcs1998 dataset :

 geographic |
  region of |
  physician |
     office |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      2,078       20.78       20.78
    Midwest |      2,497       24.97       45.75
      South |      3,190       31.90       77.65
       West |      2,235       22.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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