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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        372        3.72        3.72
          1 |        419        4.19        7.91
          2 |        474        4.74       12.65
          3 |        309        3.09       15.74
          4 |        254        2.54       18.28
          5 |        283        2.83       21.11
          6 |        317        3.17       24.28
          7 |        309        3.09       27.37
          8 |        257        2.57       29.94
          9 |        301        3.01       32.95
         10 |        317        3.17       36.12
         11 |        359        3.59       39.71
         12 |        368        3.68       43.39
         13 |        395        3.95       47.34
         14 |        466        4.66       52.00
         15 |        489        4.89       56.89
         16 |        476        4.76       61.65
         17 |        521        5.21       66.86
         18 |        570        5.70       72.56
         19 |        538        5.38       77.94
         20 |        589        5.89       83.83
         21 |        539        5.39       89.22
         22 |        482        4.82       94.04
         23 |        475        4.75       98.79
         24 |         12        0.12       98.91
         99 |        109        1.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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