Frequencies for first 10,000 rows of region variable in nhamcsopd2000 dataset :

 geographic |
  region of |
   hospital |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      5,264       52.64       52.64
    Midwest |      3,959       39.59       92.23
      South |        660        6.60       98.83
       West |        117        1.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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