Frequencies for first 10,000 rows of state_rgn_cd variable in pos2013 dataset :

      State |
Region Code |      Freq.     Percent        Cum.
------------+-----------------------------------
        001 |      4,388       43.88       43.88
         AZ |      1,360       13.60       57.48
        BAK |         97        0.97       58.45
        BER |        178        1.78       60.23
         BK |        267        2.67       62.90
        BK1 |          8        0.08       62.98
         FR |        273        2.73       65.71
         L1 |        309        3.09       68.80
         L2 |        239        2.39       71.19
         L3 |         55        0.55       71.74
         L4 |        235        2.35       74.09
         L5 |        213        2.13       76.22
         M2 |          1        0.01       76.23
        ORG |        208        2.08       78.31
        RIV |        130        1.30       79.61
        RWC |        189        1.89       81.50
         S1 |        290        2.90       84.40
         S2 |         12        0.12       84.52
         S3 |        202        2.02       86.54
         SA |         38        0.38       86.92
         SB |         30        0.30       87.22
         SD |        247        2.47       89.69
        SDS |         80        0.80       90.49
         SF |        187        1.87       92.36
         SJ |        189        1.89       94.25
         SR |         72        0.72       94.97
        TUC |        328        3.28       98.25
        VEN |        175        1.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016