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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        353        3.53        3.53
          1 |        188        1.88        5.41
          2 |        189        1.89        7.30
          3 |        129        1.29        8.59
          4 |        109        1.09        9.68
          5 |        112        1.12       10.80
          6 |        158        1.58       12.38
          7 |        188        1.88       14.26
          8 |        151        1.51       15.77
          9 |        152        1.52       17.29
         10 |        139        1.39       18.68
         11 |        160        1.60       20.28
         12 |        190        1.90       22.18
         13 |        167        1.67       23.85
         14 |        218        2.18       26.03
         15 |        268        2.68       28.71
         16 |        251        2.51       31.22
         17 |        254        2.54       33.76
         18 |        261        2.61       36.37
         19 |        255        2.55       38.92
         20 |        255        2.55       41.47
         21 |        260        2.60       44.07
         22 |        206        2.06       46.13
         23 |        222        2.22       48.35
         24 |          1        0.01       48.36
         99 |      5,164       51.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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