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

 crash time |
     (hour) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        369        3.69        3.69
          1 |        313        3.13        6.82
          2 |        329        3.29       10.11
          3 |        255        2.55       12.66
          4 |        245        2.45       15.11
          5 |        316        3.16       18.27
          6 |        384        3.84       22.11
          7 |        341        3.41       25.52
          8 |        319        3.19       28.71
          9 |        286        2.86       31.57
         10 |        383        3.83       35.40
         11 |        394        3.94       39.34
         12 |        420        4.20       43.54
         13 |        507        5.07       48.61
         14 |        455        4.55       53.16
         15 |        525        5.25       58.41
         16 |        508        5.08       63.49
         17 |        601        6.01       69.50
         18 |        538        5.38       74.88
         19 |        485        4.85       79.73
         20 |        574        5.74       85.47
         21 |        512        5.12       90.59
         22 |        465        4.65       95.24
         23 |        378        3.78       99.02
         99 |         98        0.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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