Frequencies for first 10,000 rows of region variable in nhamcsopd1999 dataset :

 geographic |
  region of |
   hospital |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      5,292       52.92       52.92
    Midwest |      3,760       37.60       90.52
      South |        817        8.17       98.69
       West |        131        1.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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