Frequencies for first 10,000 rows of region variable in nhamcsed2009 dataset :

 geographic |
     region |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,411       24.11       24.11
          2 |      1,900       19.00       43.11
          3 |      3,591       35.91       79.02
          4 |      2,098       20.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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