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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        394        3.94        3.94
          1 |        204        2.04        5.98
          2 |        176        1.76        7.74
          3 |        133        1.33        9.07
          4 |        106        1.06       10.13
          5 |         95        0.95       11.08
          6 |        193        1.93       13.01
          7 |        185        1.85       14.86
          8 |        138        1.38       16.24
          9 |        120        1.20       17.44
         10 |        138        1.38       18.82
         11 |        145        1.45       20.27
         12 |        183        1.83       22.10
         13 |        195        1.95       24.05
         14 |        236        2.36       26.41
         15 |        256        2.56       28.97
         16 |        240        2.40       31.37
         17 |        233        2.33       33.70
         18 |        309        3.09       36.79
         19 |        271        2.71       39.50
         20 |        226        2.26       41.76
         21 |        256        2.56       44.32
         22 |        225        2.25       46.57
         23 |        220        2.20       48.77
         24 |          5        0.05       48.82
         99 |      5,118       51.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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