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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        278        2.78        2.78
          1 |        198        1.98        4.76
          2 |        208        2.08        6.84
          3 |        138        1.38        8.22
          4 |        105        1.05        9.27
          5 |        112        1.12       10.39
          6 |        171        1.71       12.10
          7 |        193        1.93       14.03
          8 |        150        1.50       15.53
          9 |        133        1.33       16.86
         10 |        149        1.49       18.35
         11 |        153        1.53       19.88
         12 |        188        1.88       21.76
         13 |        185        1.85       23.61
         14 |        211        2.11       25.72
         15 |        253        2.53       28.25
         16 |        258        2.58       30.83
         17 |        220        2.20       33.03
         18 |        272        2.72       35.75
         19 |        247        2.47       38.22
         20 |        231        2.31       40.53
         21 |        240        2.40       42.93
         22 |        231        2.31       45.24
         23 |        227        2.27       47.51
         24 |          4        0.04       47.55
         99 |      5,245       52.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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