Frequencies for first 10,000 rows of region variable in namcs1999 dataset :

 geographic |
  region of |
  physician |
     office |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      2,096       20.96       20.96
    Midwest |      1,797       17.97       38.93
      South |      3,264       32.64       71.57
       West |      2,843       28.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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