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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        397        3.97        3.97
          1 |        222        2.22        6.19
          2 |        210        2.10        8.29
          3 |        160        1.60        9.89
          4 |        122        1.22       11.11
          5 |        134        1.34       12.45
          6 |        186        1.86       14.31
          7 |        204        2.04       16.35
          8 |        182        1.82       18.17
          9 |        166        1.66       19.83
         10 |        166        1.66       21.49
         11 |        186        1.86       23.35
         12 |        208        2.08       25.43
         13 |        205        2.05       27.48
         14 |        237        2.37       29.85
         15 |        303        3.03       32.88
         16 |        292        2.92       35.80
         17 |        316        3.16       38.96
         18 |        308        3.08       42.04
         19 |        279        2.79       44.83
         20 |        282        2.82       47.65
         21 |        306        3.06       50.71
         22 |        237        2.37       53.08
         23 |        256        2.56       55.64
         24 |          2        0.02       55.66
         99 |      4,434       44.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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