Frequencies for first 10,000 rows of region variable in nhamcsopd2007 dataset :

 geographic |
     region |      Freq.     Percent        Cum.
------------+-----------------------------------
  northeast |      2,629       26.29       26.29
    midwest |      3,120       31.20       57.49
      south |      2,917       29.17       86.66
       west |      1,334       13.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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