Frequencies for state variable in parkwork dataset :

      state |
     number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         19        1.74        1.74
          2 |          2        0.18        1.92
          4 |         11        1.01        2.93
          5 |         12        1.10        4.03
          6 |        189       17.32       21.36
          8 |         11        1.01       22.36
          9 |         15        1.37       23.74
         10 |          3        0.27       24.01
         11 |          1        0.09       24.11
         12 |         62        5.68       29.79
         13 |         21        1.92       31.71
         15 |          9        0.82       32.54
         16 |          2        0.18       32.72
         17 |         43        3.94       36.66
         18 |         18        1.65       38.31
         19 |          5        0.46       38.77
         20 |         15        1.37       40.15
         21 |         20        1.83       41.98
         22 |         14        1.28       43.26
         23 |          3        0.27       43.54
         24 |         16        1.47       45.00
         25 |         15        1.37       46.38
         26 |         21        1.92       48.30
         27 |          5        0.46       48.76
         29 |         26        2.38       51.15
         30 |          2        0.18       51.33
         31 |          1        0.09       51.42
         32 |          8        0.73       52.15
         34 |         51        4.67       56.83
         35 |          2        0.18       57.01
         36 |         85        7.79       64.80
         37 |         23        2.11       66.91
         38 |          4        0.37       67.28
         39 |         37        3.39       70.67
         40 |          8        0.73       71.40
         41 |          5        0.46       71.86
         42 |         79        7.24       79.10
         45 |         19        1.74       80.84
         46 |          2        0.18       81.03
         47 |         14        1.28       82.31
         48 |        123       11.27       93.58
         49 |          7        0.64       94.23
         50 |          5        0.46       94.68
         51 |         19        1.74       96.43
         53 |         14        1.28       97.71
         54 |          8        0.73       98.44
         55 |         16        1.47       99.91
         56 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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