Frequencies for first 10,000 rows of region variable in nhamcsopd2010 dataset :

 geographic |
     region |      Freq.     Percent        Cum.
------------+-----------------------------------
  northeast |      3,511       35.11       35.11
    midwest |      2,187       21.87       56.98
      south |      2,939       29.39       86.37
       west |      1,363       13.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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