Frequencies for first 10,000 rows of rgn_cd variable in pos2012 dataset :

Region Code |      Freq.     Percent        Cum.
------------+-----------------------------------
         10 |        279        2.79        2.79
          4 |      2,091       20.91       23.70
          6 |      2,062       20.62       44.32
          9 |      5,568       55.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016