Frequencies for first 10,000 rows of rgn_cd variable in pos2013 dataset :

Region Code |      Freq.     Percent        Cum.
------------+-----------------------------------
         10 |        276        2.76        2.76
          4 |      2,000       20.00       22.76
          6 |      2,047       20.47       43.23
          9 |      5,677       56.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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