Frequencies for first 10,000 rows of prov2710 variable in pos1991 dataset :

     states |
region code |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        132        1.32        1.32
        001 |      3,379       33.79       35.11
         1A |          1        0.01       35.12
         AZ |        712        7.12       42.24
        BER |        354        3.54       45.78
         BK |        344        3.44       49.22
         FR |        303        3.03       52.25
         L1 |        357        3.57       55.82
         L2 |        318        3.18       59.00
         L3 |         59        0.59       59.59
         L4 |        346        3.46       63.05
         L5 |        331        3.31       66.36
        LAB |         11        0.11       66.47
         M1 |        524        5.24       71.71
         M2 |        415        4.15       75.86
         S1 |        386        3.86       79.72
         S3 |        168        1.68       81.40
         SA |        338        3.38       84.78
         SB |        284        2.84       87.62
         SD |        368        3.68       91.30
         SF |        239        2.39       93.69
         SJ |        267        2.67       96.36
         SR |        256        2.56       98.92
        TUC |        108        1.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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