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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        604        6.04        6.04
          1 |        247        2.47        8.51
          2 |        247        2.47       10.98
          3 |        164        1.64       12.62
          4 |        121        1.21       13.83
          5 |        128        1.28       15.11
          6 |        183        1.83       16.94
          7 |        202        2.02       18.96
          8 |        178        1.78       20.74
          9 |        120        1.20       21.94
         10 |        141        1.41       23.35
         11 |        156        1.56       24.91
         12 |        175        1.75       26.66
         13 |        195        1.95       28.61
         14 |        212        2.12       30.73
         15 |        266        2.66       33.39
         16 |        271        2.71       36.10
         17 |        278        2.78       38.88
         18 |        313        3.13       42.01
         19 |        275        2.75       44.76
         20 |        264        2.64       47.40
         21 |        282        2.82       50.22
         22 |        271        2.71       52.93
         23 |        260        2.60       55.53
         24 |          5        0.05       55.58
         99 |      4,442       44.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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