Frequencies for first 10,000 rows of state_cd variable in pos2009 dataset :

      STATE |
ABBREVIATIO |
          N |      Freq.     Percent        Cum.
------------+-----------------------------------
         AK |        260        2.60        2.60
         AL |      1,872       18.72       21.32
         AR |      1,936       19.36       40.68
         AZ |      1,509       15.09       55.77
         CA |      4,423       44.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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