Frequencies for first 10,000 rows of region variable in nhamcsed1998 dataset :

 geographic |
  region of |
   hospital |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      4,502       45.02       45.02
    Midwest |      2,373       23.73       68.75
      South |      2,357       23.57       92.32
       West |        768        7.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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