Frequencies for hour variable in accident dataset :

    Time of |
Accident-Ho |
         ur |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         27        4.73        4.73
          1 |         26        4.55        9.28
          2 |         23        4.03       13.31
          3 |         17        2.98       16.29
          4 |         20        3.50       19.79
          5 |         29        5.08       24.87
          6 |         19        3.33       28.20
          7 |         18        3.15       31.35
          8 |          9        1.58       32.92
          9 |         17        2.98       35.90
         10 |         15        2.63       38.53
         11 |         13        2.28       40.81
         12 |         11        1.93       42.73
         13 |         13        2.28       45.01
         14 |         17        2.98       47.99
         15 |         13        2.28       50.26
         16 |         26        4.55       54.82
         17 |         27        4.73       59.54
         18 |         42        7.36       66.90
         19 |         39        6.83       73.73
         20 |         45        7.88       81.61
         21 |         31        5.43       87.04
         22 |         45        7.88       94.92
         23 |         29        5.08      100.00
------------+-----------------------------------
      Total |        571      100.00

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