Frequencies for first 10,000 rows of rgn_cd variable in pos2003 dataset :

region code |      Freq.     Percent        Cum.
------------+-----------------------------------
         04 |      1,666       16.66       16.66
         06 |      1,744       17.44       34.10
         09 |      6,371       63.71       97.81
         10 |        219        2.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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