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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        379        3.79        3.79
          1 |        192        1.92        5.71
          2 |        237        2.37        8.08
          3 |        149        1.49        9.57
          4 |        102        1.02       10.59
          5 |        130        1.30       11.89
          6 |        209        2.09       13.98
          7 |        218        2.18       16.16
          8 |        151        1.51       17.67
          9 |        134        1.34       19.01
         10 |        182        1.82       20.83
         11 |        185        1.85       22.68
         12 |        211        2.11       24.79
         13 |        243        2.43       27.22
         14 |        236        2.36       29.58
         15 |        303        3.03       32.61
         16 |        278        2.78       35.39
         17 |        278        2.78       38.17
         18 |        322        3.22       41.39
         19 |        318        3.18       44.57
         20 |        290        2.90       47.47
         21 |        296        2.96       50.43
         22 |        274        2.74       53.17
         23 |        270        2.70       55.87
         24 |          3        0.03       55.90
         99 |      4,410       44.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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