Frequencies for first 10,000 rows of region variable in nhamcsopd1997 dataset :

 geographic |
  region of |
   hospital |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      6,086       60.86       60.86
    Midwest |      2,806       28.06       88.92
      South |        959        9.59       98.51
       West |        149        1.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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