Frequencies for first 10,000 rows of region variable in namcs1993 dataset :

 geographic |
  region of |
  physician |
     office |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      3,011       30.11       30.11
    Midwest |      2,556       25.56       55.67
      South |      2,617       26.17       81.84
       West |      1,816       18.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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