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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        404        4.04        4.04
          1 |        365        3.65        7.69
          2 |        411        4.11       11.80
          3 |        242        2.42       14.22
          4 |        204        2.04       16.26
          5 |        272        2.72       18.98
          6 |        326        3.26       22.24
          7 |        316        3.16       25.40
          8 |        257        2.57       27.97
          9 |        268        2.68       30.65
         10 |        317        3.17       33.82
         11 |        344        3.44       37.26
         12 |        397        3.97       41.23
         13 |        428        4.28       45.51
         14 |        476        4.76       50.27
         15 |        577        5.77       56.04
         16 |        540        5.40       61.44
         17 |        534        5.34       66.78
         18 |        609        6.09       72.87
         19 |        545        5.45       78.32
         20 |        582        5.82       84.14
         21 |        492        4.92       89.06
         22 |        482        4.82       93.88
         23 |        501        5.01       98.89
         24 |          8        0.08       98.97
         99 |        103        1.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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