Frequencies for first 10,000 rows of prov2710 variable in pos1993 dataset :

     states |
region code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        126        1.26        1.26
        001 |      3,026       30.26       31.52
         1A |          1        0.01       31.53
         AZ |        905        9.05       40.58
        BER |        445        4.45       45.03
         BK |        352        3.52       48.55
         FR |        360        3.60       52.15
         L1 |        360        3.60       55.75
         L2 |        320        3.20       58.95
         L3 |         67        0.67       59.62
         L4 |        320        3.20       62.82
         L5 |        305        3.05       65.87
        LAB |         11        0.11       65.98
         M1 |        453        4.53       70.51
         M2 |        344        3.44       73.95
         S1 |        404        4.04       77.99
         S3 |        196        1.96       79.95
         SA |        329        3.29       83.24
         SB |        343        3.43       86.67
         SD |        403        4.03       90.70
         SF |        242        2.42       93.12
         SJ |        280        2.80       95.92
         SR |        302        3.02       98.94
        TUC |        106        1.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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