Frequencies for first 10,000 rows of region variable in namcs2000 dataset :

 geographic |
  region of |
  physician |
     office |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      2,325       23.25       23.25
    Midwest |      2,634       26.34       49.59
      South |      2,674       26.74       76.33
       West |      2,367       23.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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