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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        432        4.32        4.32
          1 |        469        4.69        9.01
          2 |        424        4.24       13.25
          3 |        289        2.89       16.14
          4 |        192        1.92       18.06
          5 |        253        2.53       20.59
          6 |        301        3.01       23.60
          7 |        292        2.92       26.52
          8 |        271        2.71       29.23
          9 |        290        2.90       32.13
         10 |        341        3.41       35.54
         11 |        350        3.50       39.04
         12 |        344        3.44       42.48
         13 |        383        3.83       46.31
         14 |        466        4.66       50.97
         15 |        508        5.08       56.05
         16 |        528        5.28       61.33
         17 |        506        5.06       66.39
         18 |        615        6.15       72.54
         19 |        571        5.71       78.25
         20 |        562        5.62       83.87
         21 |        552        5.52       89.39
         22 |        477        4.77       94.16
         23 |        489        4.89       99.05
         24 |          6        0.06       99.11
         99 |         89        0.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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