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

     County |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        433        4.33        4.33
          3 |        252        2.52        6.85
          5 |        195        1.95        8.80
          7 |        129        1.29       10.09
          9 |        175        1.75       11.84
         11 |        191        1.91       13.75
         12 |         12        0.12       13.87
         13 |        459        4.59       18.46
         15 |        134        1.34       19.80
         17 |         88        0.88       20.68
         19 |        301        3.01       23.69
         20 |         17        0.17       23.86
         21 |        123        1.23       25.09
         23 |         60        0.60       25.69
         25 |        251        2.51       28.20
         27 |         56        0.56       28.76
         29 |        188        1.88       30.64
         31 |        162        1.62       32.26
         33 |         72        0.72       32.98
         35 |         51        0.51       33.49
         37 |      1,193       11.93       45.42
         39 |         59        0.59       46.01
         41 |         83        0.83       46.84
         43 |         47        0.47       47.31
         44 |          1        0.01       47.32
         45 |         63        0.63       47.95
         47 |         82        0.82       48.77
         49 |         32        0.32       49.09
         51 |         46        0.46       49.55
         53 |        105        1.05       50.60
         55 |         65        0.65       51.25
         57 |        162        1.62       52.87
         59 |        351        3.51       56.38
         61 |         57        0.57       56.95
         63 |         29        0.29       57.24
         65 |        302        3.02       60.26
         67 |        184        1.84       62.10
         69 |         95        0.95       63.05
         71 |        456        4.56       67.61
         73 |        492        4.92       72.53
         75 |         68        0.68       73.21
         77 |        152        1.52       74.73
         79 |         90        0.90       75.63
         81 |        109        1.09       76.72
         83 |        113        1.13       77.85
         85 |        175        1.75       79.60
         87 |         80        0.80       80.40
         89 |        110        1.10       81.50
         90 |          7        0.07       81.57
         91 |         28        0.28       81.85
         93 |         56        0.56       82.41
         95 |        171        1.71       84.12
         97 |        168        1.68       85.80
         99 |        187        1.87       87.67
        101 |        111        1.11       88.78
        103 |        105        1.05       89.83
        104 |          1        0.01       89.84
        105 |         62        0.62       90.46
        107 |        119        1.19       91.65
        109 |         57        0.57       92.22
        110 |          4        0.04       92.26
        111 |        137        1.37       93.63
        113 |         67        0.67       94.30
        115 |         79        0.79       95.09
        117 |         48        0.48       95.57
        119 |         63        0.63       96.20
        121 |         28        0.28       96.48
        122 |          9        0.09       96.57
        123 |         39        0.39       96.96
        125 |         62        0.62       97.58
        127 |         75        0.75       98.33
        129 |         14        0.14       98.47
        130 |          1        0.01       98.48
        131 |         30        0.30       98.78
        133 |         21        0.21       98.99
        135 |          5        0.05       99.04
        137 |          2        0.02       99.06
        138 |          1        0.01       99.07
        139 |          9        0.09       99.16
        141 |          5        0.05       99.21
        143 |         21        0.21       99.42
        145 |         12        0.12       99.54
        147 |          2        0.02       99.56
        149 |         11        0.11       99.67
        150 |          1        0.01       99.68
        161 |          1        0.01       99.69
        170 |         19        0.19       99.88
        180 |          1        0.01       99.89
        188 |          1        0.01       99.90
        201 |          1        0.01       99.91
        220 |          1        0.01       99.92
        261 |          3        0.03       99.95
        290 |          2        0.02       99.97
        997 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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