Frequencies for first 10,000 rows of region variable in nhamcsopd2009 dataset :

 geographic |
     region |      Freq.     Percent        Cum.
------------+-----------------------------------
  northeast |      3,835       38.35       38.35
    midwest |      2,200       22.00       60.35
      south |      2,447       24.47       84.82
       west |      1,518       15.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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