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

    Arrival |
       Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        746        7.46        7.46
          1 |        165        1.65        9.11
          2 |        121        1.21       10.32
          3 |         86        0.86       11.18
          4 |         47        0.47       11.65
          5 |         52        0.52       12.17
          6 |         63        0.63       12.80
          7 |         70        0.70       13.50
          8 |         53        0.53       14.03
          9 |         56        0.56       14.59
         10 |         46        0.46       15.05
         11 |         70        0.70       15.75
         12 |         90        0.90       16.65
         13 |         68        0.68       17.33
         14 |         90        0.90       18.23
         15 |         87        0.87       19.10
         16 |        100        1.00       20.10
         17 |        118        1.18       21.28
         18 |        137        1.37       22.65
         19 |        146        1.46       24.11
         20 |        114        1.14       25.25
         21 |        114        1.14       26.39
         22 |        139        1.39       27.78
         23 |        121        1.21       28.99
         24 |          3        0.03       29.02
         99 |      7,098       70.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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