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

      STATE |
REGION CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         87        0.87        0.87
        001 |      4,050       40.50       41.37
         AZ |      1,196       11.96       53.33
        BAK |         79        0.79       54.12
        BER |        220        2.20       56.32
         BK |        266        2.66       58.98
        BK1 |         20        0.20       59.18
         FR |        242        2.42       61.60
         L1 |        378        3.78       65.38
         L2 |        290        2.90       68.28
         L3 |        110        1.10       69.38
         L4 |        283        2.83       72.21
         L5 |        260        2.60       74.81
         M2 |          2        0.02       74.83
        ORG |        209        2.09       76.92
        RIV |        136        1.36       78.28
        RWC |        211        2.11       80.39
         S1 |        342        3.42       83.81
         S2 |         15        0.15       83.96
         S3 |        190        1.90       85.86
         SA |         42        0.42       86.28
         SB |         35        0.35       86.63
         SD |        289        2.89       89.52
        SDS |         80        0.80       90.32
         SF |        202        2.02       92.34
         SJ |        213        2.13       94.47
         SR |         82        0.82       95.29
        TUC |        294        2.94       98.23
        VEN |        177        1.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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