Frequencies for state variable in pdp2018 dataset :

                   State |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
                         |          1        0.08        0.08
                 Alabama |         25        2.11        2.19
                  Alaska |         19        1.60        3.79
          American Samoa |          1        0.08        3.88
                 Arizona |         23        1.94        5.82
                Arkansas |         21        1.77        7.59
              California |         25        2.11        9.70
                Colorado |         24        2.02       11.72
             Connecticut |         22        1.85       13.58
                Delaware |         21        1.77       15.35
                 Florida |         21        1.77       17.12
                 Georgia |         24        2.02       19.14
                    Guam |          3        0.25       19.39
                  Hawaii |         20        1.69       21.08
                   Idaho |         25        2.11       23.19
                Illinois |         24        2.02       25.21
                 Indiana |         24        2.02       27.23
                    Iowa |         23        1.94       29.17
                  Kansas |         23        1.94       31.11
                Kentucky |         24        2.02       33.14
               Louisiana |         21        1.77       34.91
                   Maine |         24        2.02       36.93
                Maryland |         21        1.77       38.70
           Massachusetts |         22        1.85       40.56
                Michigan |         24        2.02       42.58
               Minnesota |         23        1.94       44.52
             Mississippi |         20        1.69       46.21
                Missouri |         24        2.02       48.23
                 Montana |         23        1.94       50.17
                Nebraska |         23        1.94       52.11
                  Nevada |         24        2.02       54.13
           New Hampshire |         24        2.02       56.16
              New Jersey |         22        1.85       58.01
              New Mexico |         24        2.02       60.03
                New York |         20        1.69       61.72
          North Carolina |         24        2.02       63.74
            North Dakota |         23        1.94       65.68
Northern Mariana Islands |          2        0.17       65.85
                    Ohio |         23        1.94       67.79
                Oklahoma |         23        1.94       69.73
                  Oregon |         22        1.85       71.59
            Pennsylvania |         26        2.19       73.78
             Puerto Rico |          6        0.51       74.28
            Rhode Island |         22        1.85       76.14
          South Carolina |         22        1.85       77.99
            South Dakota |         23        1.94       79.93
               Tennessee |         25        2.11       82.04
                   Texas |         24        2.02       84.06
                    Utah |         25        2.11       86.17
                 Vermont |         22        1.85       88.03
          Virgin Islands |          1        0.08       88.11
                Virginia |         24        2.02       90.13
              Washington |         22        1.85       91.99
         Washington D.C. |         21        1.77       93.76
           West Virginia |         26        2.19       95.95
               Wisconsin |         25        2.11       98.06
                 Wyoming |         23        1.94      100.00
-------------------------+-----------------------------------
                   Total |      1,186      100.00

by Jean Roth , jroth@nber.org , 10 Sep 2018