Frequencies for hour variable in accident dataset :

    Time of |
Accident-Ho |
         ur |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         21        4.29        4.29
          1 |         19        3.89        8.18
          2 |         20        4.09       12.27
          3 |         10        2.04       14.31
          4 |         11        2.25       16.56
          5 |         15        3.07       19.63
          6 |         15        3.07       22.70
          7 |          7        1.43       24.13
          8 |         11        2.25       26.38
          9 |         14        2.86       29.24
         10 |         17        3.48       32.72
         11 |         17        3.48       36.20
         12 |         14        2.86       39.06
         13 |         20        4.09       43.15
         14 |         16        3.27       46.42
         15 |         21        4.29       50.72
         16 |         16        3.27       53.99
         17 |         14        2.86       56.85
         18 |         31        6.34       63.19
         19 |         51       10.43       73.62
         20 |         38        7.77       81.39
         21 |         31        6.34       87.73
         22 |         30        6.13       93.87
         23 |         30        6.13      100.00
------------+-----------------------------------
      Total |        489      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016