Frequencies for first 10,000 rows of state_cd variable in pos1992 dataset :

      state |
abbreviatio |
          n |      Freq.     Percent        Cum.
------------+-----------------------------------
         AK |        148        1.48        1.48
         AL |      1,294       12.94       14.42
         AR |      1,249       12.49       26.91
         AZ |        992        9.92       36.83
         CA |      5,507       55.07       91.90
         CO |        810        8.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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