Frequencies for first 10,000 rows of rgn_cd variable in pos2007 dataset :

region code |      Freq.     Percent        Cum.
------------+-----------------------------------
         04 |      1,816       18.16       18.16
         06 |      1,891       18.91       37.07
         09 |      6,044       60.44       97.51
         10 |        249        2.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017