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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        518        5.18        5.18
          1 |        258        2.58        7.76
          2 |        264        2.64       10.40
          3 |        136        1.36       11.76
          4 |        116        1.16       12.92
          5 |        116        1.16       14.08
          6 |        183        1.83       15.91
          7 |        193        1.93       17.84
          8 |        159        1.59       19.43
          9 |        141        1.41       20.84
         10 |        166        1.66       22.50
         11 |        184        1.84       24.34
         12 |        207        2.07       26.41
         13 |        230        2.30       28.71
         14 |        276        2.76       31.47
         15 |        277        2.77       34.24
         16 |        304        3.04       37.28
         17 |        283        2.83       40.11
         18 |        355        3.55       43.66
         19 |        327        3.27       46.93
         20 |        313        3.13       50.06
         21 |        295        2.95       53.01
         22 |        304        3.04       56.05
         23 |        276        2.76       58.81
         24 |          4        0.04       58.85
         99 |      4,115       41.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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