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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        293        2.93        2.93
          1 |        223        2.23        5.16
          2 |        218        2.18        7.34
          3 |        179        1.79        9.13
          4 |        127        1.27       10.40
          5 |        127        1.27       11.67
          6 |        195        1.95       13.62
          7 |        241        2.41       16.03
          8 |        188        1.88       17.91
          9 |        167        1.67       19.58
         10 |        162        1.62       21.20
         11 |        199        1.99       23.19
         12 |        232        2.32       25.51
         13 |        219        2.19       27.70
         14 |        258        2.58       30.28
         15 |        304        3.04       33.32
         16 |        282        2.82       36.14
         17 |        275        2.75       38.89
         18 |        295        2.95       41.84
         19 |        286        2.86       44.70
         20 |        288        2.88       47.58
         21 |        275        2.75       50.33
         22 |        268        2.68       53.01
         23 |        267        2.67       55.68
         24 |          2        0.02       55.70
         99 |      4,430       44.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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