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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        394        3.94        3.94
          1 |        426        4.26        8.20
          2 |        453        4.53       12.73
          3 |        296        2.96       15.69
          4 |        241        2.41       18.10
          5 |        280        2.80       20.90
          6 |        374        3.74       24.64
          7 |        293        2.93       27.57
          8 |        263        2.63       30.20
          9 |        248        2.48       32.68
         10 |        329        3.29       35.97
         11 |        365        3.65       39.62
         12 |        364        3.64       43.26
         13 |        448        4.48       47.74
         14 |        470        4.70       52.44
         15 |        488        4.88       57.32
         16 |        484        4.84       62.16
         17 |        522        5.22       67.38
         18 |        550        5.50       72.88
         19 |        590        5.90       78.78
         20 |        550        5.50       84.28
         21 |        536        5.36       89.64
         22 |        455        4.55       94.19
         23 |        439        4.39       98.58
         24 |         14        0.14       98.72
         99 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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