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

 Crash Time |
     (Hour) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        383        3.83        3.83
          1 |        403        4.03        7.86
          2 |        430        4.30       12.16
          3 |        325        3.25       15.41
          4 |        246        2.46       17.87
          5 |        300        3.00       20.87
          6 |        358        3.58       24.45
          7 |        329        3.29       27.74
          8 |        271        2.71       30.45
          9 |        281        2.81       33.26
         10 |        318        3.18       36.44
         11 |        363        3.63       40.07
         12 |        380        3.80       43.87
         13 |        427        4.27       48.14
         14 |        437        4.37       52.51
         15 |        436        4.36       56.87
         16 |        514        5.14       62.01
         17 |        527        5.27       67.28
         18 |        611        6.11       73.39
         19 |        588        5.88       79.27
         20 |        546        5.46       84.73
         21 |        532        5.32       90.05
         22 |        446        4.46       94.51
         23 |        430        4.30       98.81
         99 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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