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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        405        4.05        4.05
          1 |        419        4.19        8.24
          2 |        391        3.91       12.15
          3 |        285        2.85       15.00
          4 |        264        2.64       17.64
          5 |        309        3.09       20.73
          6 |        312        3.12       23.85
          7 |        308        3.08       26.93
          8 |        252        2.52       29.45
          9 |        284        2.84       32.29
         10 |        289        2.89       35.18
         11 |        354        3.54       38.72
         12 |        407        4.07       42.79
         13 |        405        4.05       46.84
         14 |        491        4.91       51.75
         15 |        499        4.99       56.74
         16 |        510        5.10       61.84
         17 |        558        5.58       67.42
         18 |        583        5.83       73.25
         19 |        537        5.37       78.62
         20 |        555        5.55       84.17
         21 |        535        5.35       89.52
         22 |        456        4.56       94.08
         23 |        454        4.54       98.62
         24 |         14        0.14       98.76
         99 |        124        1.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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