Frequencies for state variable in pdp2009 dataset :

                   State |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
                 Alabama |         49        1.91        1.91
                  Alaska |         45        1.76        3.67
          American Samoa |          4        0.16        3.82
                 Arizona |         49        1.91        5.74
                Arkansas |         52        2.03        7.76
              California |         51        1.99        9.75
                Colorado |         53        2.07       11.82
             Connecticut |         47        1.83       13.66
                Delaware |         48        1.87       15.53
                 Florida |         54        2.11       17.64
                 Georgia |         50        1.95       19.59
                    Guam |          4        0.16       19.74
                  Hawaii |         47        1.83       21.58
                   Idaho |         51        1.99       23.57
                Illinois |         49        1.91       25.48
                 Indiana |         48        1.87       27.35
                    Iowa |         48        1.87       29.22
                  Kansas |         48        1.87       31.10
                Kentucky |         48        1.87       32.97
               Louisiana |         47        1.83       34.80
                   Maine |         46        1.79       36.60
                Maryland |         48        1.87       38.47
           Massachusetts |         47        1.83       40.30
                Michigan |         51        1.99       42.29
               Minnesota |         48        1.87       44.17
             Mississippi |         47        1.83       46.00
                Missouri |         48        1.87       47.87
                 Montana |         48        1.87       49.75
                Nebraska |         48        1.87       51.62
                  Nevada |         49        1.91       53.53
           New Hampshire |         46        1.79       55.33
              New Jersey |         52        2.03       57.35
              New Mexico |         50        1.95       59.31
                New York |         51        1.99       61.30
          North Carolina |         49        1.91       63.21
            North Dakota |         48        1.87       65.08
Northern Mariana Islands |          4        0.16       65.24
                    Ohio |         49        1.91       67.15
                Oklahoma |         49        1.91       69.06
                  Oregon |         48        1.87       70.93
            Pennsylvania |         57        2.22       73.16
             Puerto Rico |         33        1.29       74.44
            Rhode Island |         47        1.83       76.28
          South Carolina |         51        1.99       78.27
            South Dakota |         48        1.87       80.14
               Tennessee |         49        1.91       82.05
                   Texas |         53        2.07       84.12
                    Utah |         51        1.99       86.11
                 Vermont |         47        1.83       87.94
          Virgin Islands |          7        0.27       88.22
                Virginia |         48        1.87       90.09
              Washington |         48        1.87       91.96
         Washington D.C. |         48        1.87       93.84
           West Virginia |         57        2.22       96.06
               Wisconsin |         53        2.07       98.13
                 Wyoming |         48        1.87      100.00
-------------------------+-----------------------------------
                   Total |      2,563      100.00

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