Frequencies for state variable in parkwork dataset :

      state |
     number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         23        2.01        2.01
          2 |          1        0.09        2.09
          4 |         17        1.48        3.58
          5 |         22        1.92        5.50
          6 |        195       17.02       22.51
          8 |         15        1.31       23.82
          9 |         22        1.92       25.74
         10 |          9        0.79       26.53
         11 |          2        0.17       26.70
         12 |         84        7.33       34.03
         13 |         23        2.01       36.04
         15 |          8        0.70       36.74
         16 |          2        0.17       36.91
         17 |         34        2.97       39.88
         18 |         23        2.01       41.88
         19 |          9        0.79       42.67
         20 |          9        0.79       43.46
         21 |         16        1.40       44.85
         22 |         16        1.40       46.25
         23 |         12        1.05       47.29
         24 |         16        1.40       48.69
         25 |         23        2.01       50.70
         26 |         28        2.44       53.14
         27 |         18        1.57       54.71
         28 |          3        0.26       54.97
         29 |         23        2.01       56.98
         30 |          3        0.26       57.24
         32 |          9        0.79       58.03
         33 |          3        0.26       58.29
         34 |         31        2.71       60.99
         35 |          1        0.09       61.08
         36 |         99        8.64       69.72
         37 |         26        2.27       71.99
         38 |          2        0.17       72.16
         39 |         32        2.79       74.96
         40 |         10        0.87       75.83
         41 |          3        0.26       76.09
         42 |         66        5.76       81.85
         44 |          3        0.26       82.11
         45 |         19        1.66       83.77
         46 |          5        0.44       84.21
         47 |         15        1.31       85.51
         48 |         96        8.38       93.89
         49 |         19        1.66       95.55
         51 |         20        1.75       97.29
         53 |         11        0.96       98.25
         54 |          7        0.61       98.87
         55 |          9        0.79       99.65
         56 |          4        0.35      100.00
------------+-----------------------------------
      Total |      1,146      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016