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

     states |
region code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        125        1.25        1.25
        001 |      3,461       34.61       35.86
         1A |          1        0.01       35.87
         AZ |        848        8.48       44.35
        BER |        398        3.98       48.33
         BK |        332        3.32       51.65
         FR |        323        3.23       54.88
         L1 |        339        3.39       58.27
         L2 |        306        3.06       61.33
         L3 |         64        0.64       61.97
         L4 |        307        3.07       65.04
         L5 |        287        2.87       67.91
        LAB |         11        0.11       68.02
         M1 |        453        4.53       72.55
         M2 |        344        3.44       75.99
         S1 |        372        3.72       79.71
         S3 |        175        1.75       81.46
         SA |        300        3.00       84.46
         SB |        314        3.14       87.60
         SD |        372        3.72       91.32
         SF |        223        2.23       93.55
         SJ |        269        2.69       96.24
         SR |        268        2.68       98.92
        TUC |        108        1.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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