Frequencies for state variable in pdp2010 dataset :

                   State |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
                 Alabama |         46        1.91        1.91
                  Alaska |         41        1.70        3.61
          American Samoa |          3        0.12        3.73
                 Arizona |         46        1.91        5.64
                Arkansas |         49        2.03        7.68
              California |         47        1.95        9.63
                Colorado |         48        1.99       11.62
             Connecticut |         48        1.99       13.61
                Delaware |         45        1.87       15.48
                 Florida |         49        2.03       17.51
                 Georgia |         45        1.87       19.38
                    Guam |          3        0.12       19.50
                  Hawaii |         41        1.70       21.20
                   Idaho |         48        1.99       23.20
                Illinois |         46        1.91       25.10
                 Indiana |         44        1.83       26.93
                    Iowa |         46        1.91       28.84
                  Kansas |         46        1.91       30.75
                Kentucky |         44        1.83       32.57
               Louisiana |         45        1.87       34.44
                   Maine |         43        1.78       36.22
                Maryland |         45        1.87       38.09
           Massachusetts |         48        1.99       40.08
                Michigan |         46        1.91       41.99
               Minnesota |         46        1.91       43.90
             Mississippi |         45        1.87       45.77
                Missouri |         45        1.87       47.63
                 Montana |         46        1.91       49.54
                Nebraska |         46        1.91       51.45
                  Nevada |         46        1.91       53.36
           New Hampshire |         43        1.78       55.15
              New Jersey |         47        1.95       57.10
              New Mexico |         47        1.95       59.05
                New York |         50        2.07       61.12
          North Carolina |         47        1.95       63.07
            North Dakota |         46        1.91       64.98
Northern Mariana Islands |          3        0.12       65.10
                    Ohio |         46        1.91       67.01
                Oklahoma |         46        1.91       68.92
                  Oregon |         44        1.83       70.75
            Pennsylvania |         55        2.28       73.03
             Puerto Rico |         29        1.20       74.23
            Rhode Island |         48        1.99       76.22
          South Carolina |         47        1.95       78.17
            South Dakota |         46        1.91       80.08
               Tennessee |         46        1.91       81.99
                   Texas |         50        2.07       84.07
                    Utah |         48        1.99       86.06
                 Vermont |         48        1.99       88.05
          Virgin Islands |          6        0.25       88.30
                Virginia |         44        1.83       90.12
              Washington |         44        1.83       91.95
         Washington D.C. |         45        1.87       93.82
           West Virginia |         55        2.28       96.10
               Wisconsin |         48        1.99       98.09
                 Wyoming |         46        1.91      100.00
-------------------------+-----------------------------------
                   Total |      2,410      100.00

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