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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        376        3.76        3.76
          1 |        372        3.72        7.48
          2 |        362        3.62       11.10
          3 |        250        2.50       13.60
          4 |        249        2.49       16.09
          5 |        277        2.77       18.86
          6 |        366        3.66       22.52
          7 |        349        3.49       26.01
          8 |        298        2.98       28.99
          9 |        299        2.99       31.98
         10 |        358        3.58       35.56
         11 |        342        3.42       38.98
         12 |        378        3.78       42.76
         13 |        388        3.88       46.64
         14 |        462        4.62       51.26
         15 |        542        5.42       56.68
         16 |        550        5.50       62.18
         17 |        567        5.67       67.85
         18 |        591        5.91       73.76
         19 |        551        5.51       79.27
         20 |        532        5.32       84.59
         21 |        533        5.33       89.92
         22 |        455        4.55       94.47
         23 |        445        4.45       98.92
         24 |          6        0.06       98.98
         99 |        102        1.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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