Frequencies for state variable in pdp2008 dataset :

                   State |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
                 Alabama |         53        1.91        1.91
                  Alaska |         47        1.69        3.60
          American Samoa |          4        0.14        3.75
                 Arizona |         51        1.84        5.58
                Arkansas |         55        1.98        7.56
              California |         56        2.02        9.58
                Colorado |         55        1.98       11.56
             Connecticut |         51        1.84       13.40
                Delaware |         52        1.87       15.27
                 Florida |         58        2.09       17.36
                 Georgia |         54        1.95       19.31
                    Guam |          4        0.14       19.45
                  Hawaii |         49        1.77       21.22
                   Idaho |         54        1.95       23.16
                Illinois |         53        1.91       25.07
                 Indiana |         52        1.87       26.95
                    Iowa |         52        1.87       28.82
                  Kansas |         52        1.87       30.69
                Kentucky |         52        1.87       32.56
               Louisiana |         50        1.80       34.37
                   Maine |         53        1.91       36.28
                Maryland |         52        1.87       38.15
           Massachusetts |         51        1.84       39.99
                Michigan |         55        1.98       41.97
               Minnesota |         52        1.87       43.84
             Mississippi |         49        1.77       45.61
                Missouri |         52        1.87       47.48
                 Montana |         52        1.87       49.35
                Nebraska |         52        1.87       51.22
                  Nevada |         53        1.91       53.13
           New Hampshire |         53        1.91       55.04
              New Jersey |         57        2.05       57.10
              New Mexico |         55        1.98       59.08
                New York |         55        1.98       61.06
          North Carolina |         52        1.87       62.93
            North Dakota |         52        1.87       64.81
Northern Mariana Islands |          4        0.14       64.95
                    Ohio |         58        2.09       67.04
                Oklahoma |         52        1.87       68.91
                  Oregon |         55        1.98       70.89
            Pennsylvania |         63        2.27       73.16
             Puerto Rico |         34        1.22       74.39
            Rhode Island |         51        1.84       76.22
          South Carolina |         56        2.02       78.24
            South Dakota |         52        1.87       80.12
               Tennessee |         53        1.91       82.02
                   Texas |         56        2.02       84.04
                    Utah |         54        1.95       85.99
                 Vermont |         51        1.84       87.82
          Virgin Islands |          7        0.25       88.08
                Virginia |         52        1.87       89.95
              Washington |         55        1.98       91.93
         Washington D.C. |         52        1.87       93.80
           West Virginia |         63        2.27       96.07
               Wisconsin |         57        2.05       98.13
                 Wyoming |         52        1.87      100.00
-------------------------+-----------------------------------
                   Total |      2,776      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016