Frequencies for first 10,000 rows of region variable in nhamcsopd2006 dataset :

 geographic |
     region |      Freq.     Percent        Cum.
------------+-----------------------------------
  Northeast |      2,631       26.31       26.31
    Midwest |      2,981       29.81       56.12
      South |      3,088       30.88       87.00
       West |      1,300       13.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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