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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        390        3.90        3.90
          1 |        214        2.14        6.04
          2 |        232        2.32        8.36
          3 |        148        1.48        9.84
          4 |        125        1.25       11.09
          5 |        140        1.40       12.49
          6 |        238        2.38       14.87
          7 |        240        2.40       17.27
          8 |        193        1.93       19.20
          9 |        179        1.79       20.99
         10 |        223        2.23       23.22
         11 |        197        1.97       25.19
         12 |        227        2.27       27.46
         13 |        240        2.40       29.86
         14 |        271        2.71       32.57
         15 |        292        2.92       35.49
         16 |        331        3.31       38.80
         17 |        331        3.31       42.11
         18 |        337        3.37       45.48
         19 |        335        3.35       48.83
         20 |        318        3.18       52.01
         21 |        320        3.20       55.21
         22 |        280        2.80       58.01
         23 |        255        2.55       60.56
         24 |          2        0.02       60.58
         99 |      3,942       39.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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