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 |        204        2.04        5.22
          2 |        212        2.12        7.34
          3 |        128        1.28        8.62
          4 |        107        1.07        9.69
          5 |        148        1.48       11.17
          6 |        168        1.68       12.85
          7 |        179        1.79       14.64
          8 |        127        1.27       15.91
          9 |        139        1.39       17.30
         10 |        159        1.59       18.89
         11 |        179        1.79       20.68
         12 |        172        1.72       22.40
         13 |        206        2.06       24.46
         14 |        236        2.36       26.82
         15 |        260        2.60       29.42
         16 |        228        2.28       31.70
         17 |        251        2.51       34.21
         18 |        256        2.56       36.77
         19 |        236        2.36       39.13
         20 |        294        2.94       42.07
         21 |        236        2.36       44.43
         22 |        208        2.08       46.51
         23 |        223        2.23       48.74
         24 |          2        0.02       48.76
         99 |      5,124       51.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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