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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        318        3.18        3.18
          1 |        203        2.03        5.21
          2 |        195        1.95        7.16
          3 |        131        1.31        8.47
          4 |        103        1.03        9.50
          5 |        100        1.00       10.50
          6 |        140        1.40       11.90
          7 |        159        1.59       13.49
          8 |        138        1.38       14.87
          9 |        126        1.26       16.13
         10 |        138        1.38       17.51
         11 |        141        1.41       18.92
         12 |        170        1.70       20.62
         13 |        149        1.49       22.11
         14 |        201        2.01       24.12
         15 |        233        2.33       26.45
         16 |        218        2.18       28.63
         17 |        252        2.52       31.15
         18 |        262        2.62       33.77
         19 |        258        2.58       36.35
         20 |        239        2.39       38.74
         21 |        252        2.52       41.26
         22 |        225        2.25       43.51
         23 |        227        2.27       45.78
         24 |          2        0.02       45.80
         99 |      5,420       54.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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