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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        328        3.28        3.28
          1 |        226        2.26        5.54
          2 |        211        2.11        7.65
          3 |        161        1.61        9.26
          4 |        134        1.34       10.60
          5 |        156        1.56       12.16
          6 |        230        2.30       14.46
          7 |        238        2.38       16.84
          8 |        196        1.96       18.80
          9 |        188        1.88       20.68
         10 |        182        1.82       22.50
         11 |        225        2.25       24.75
         12 |        213        2.13       26.88
         13 |        217        2.17       29.05
         14 |        266        2.66       31.71
         15 |        334        3.34       35.05
         16 |        313        3.13       38.18
         17 |        318        3.18       41.36
         18 |        308        3.08       44.44
         19 |        343        3.43       47.87
         20 |        319        3.19       51.06
         21 |        285        2.85       53.91
         22 |        250        2.50       56.41
         23 |        240        2.40       58.81
         24 |          3        0.03       58.84
         99 |      4,116       41.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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