Frequencies for first 10,000 rows of county variable in accident dataset :

     County |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        409        4.09        4.09
          3 |        191        1.91        6.00
          5 |        191        1.91        7.91
          7 |        116        1.16        9.07
          9 |        212        2.12       11.19
         11 |        241        2.41       13.60
         12 |         15        0.15       13.75
         13 |        491        4.91       18.66
         15 |        112        1.12       19.78
         17 |         96        0.96       20.74
         19 |        295        2.95       23.69
         20 |         36        0.36       24.05
         21 |        113        1.13       25.18
         23 |         60        0.60       25.78
         25 |        345        3.45       29.23
         27 |         59        0.59       29.82
         29 |        156        1.56       31.38
         31 |        180        1.80       33.18
         33 |         77        0.77       33.95
         35 |         57        0.57       34.52
         37 |      1,074       10.74       45.26
         39 |         50        0.50       45.76
         40 |          1        0.01       45.77
         41 |         99        0.99       46.76
         43 |         46        0.46       47.22
         45 |         74        0.74       47.96
         47 |         63        0.63       48.59
         49 |         38        0.38       48.97
         50 |          1        0.01       48.98
         51 |         44        0.44       49.42
         53 |         92        0.92       50.34
         55 |         66        0.66       51.00
         57 |        221        2.21       53.21
         59 |        343        3.43       56.64
         61 |         62        0.62       57.26
         63 |         33        0.33       57.59
         65 |        267        2.67       60.26
         67 |        168        1.68       61.94
         69 |         93        0.93       62.87
         70 |          3        0.03       62.90
         71 |        379        3.79       66.69
         73 |        468        4.68       71.37
         75 |         88        0.88       72.25
         77 |        106        1.06       73.31
         79 |         63        0.63       73.94
         81 |        110        1.10       75.04
         83 |        113        1.13       76.17
         85 |        209        2.09       78.26
         87 |         81        0.81       79.07
         89 |         85        0.85       79.92
         90 |         14        0.14       80.06
         91 |         40        0.40       80.46
         93 |         41        0.41       80.87
         95 |        174        1.74       82.61
         97 |        175        1.75       84.36
         99 |        221        2.21       86.57
        100 |          1        0.01       86.58
        101 |        131        1.31       87.89
        103 |        146        1.46       89.35
        105 |        103        1.03       90.38
        107 |        122        1.22       91.60
        109 |         52        0.52       92.12
        110 |          3        0.03       92.15
        111 |        153        1.53       93.68
        113 |         50        0.50       94.18
        115 |         94        0.94       95.12
        117 |         65        0.65       95.77
        119 |         55        0.55       96.32
        120 |         13        0.13       96.45
        121 |         21        0.21       96.66
        123 |         56        0.56       97.22
        125 |         36        0.36       97.58
        127 |         98        0.98       98.56
        129 |         15        0.15       98.71
        131 |         33        0.33       99.04
        133 |          6        0.06       99.10
        135 |          4        0.04       99.14
        137 |          3        0.03       99.17
        139 |         12        0.12       99.29
        141 |          3        0.03       99.32
        143 |         21        0.21       99.53
        145 |          7        0.07       99.60
        147 |          3        0.03       99.63
        149 |          2        0.02       99.65
        150 |          1        0.01       99.66
        170 |         13        0.13       99.79
        180 |          2        0.02       99.81
        210 |          4        0.04       99.85
        230 |          2        0.02       99.87
        240 |          1        0.01       99.88
        260 |          3        0.03       99.91
        270 |          2        0.02       99.93
        280 |          1        0.01       99.94
        290 |          5        0.05       99.99
        997 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016