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

    Arrival |
       Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,040       10.40       10.40
          1 |        128        1.28       11.68
          2 |         99        0.99       12.67
          3 |         91        0.91       13.58
          4 |         46        0.46       14.04
          5 |         38        0.38       14.42
          6 |         65        0.65       15.07
          7 |         65        0.65       15.72
          8 |         62        0.62       16.34
          9 |         49        0.49       16.83
         10 |         56        0.56       17.39
         11 |         76        0.76       18.15
         12 |         57        0.57       18.72
         13 |         66        0.66       19.38
         14 |         97        0.97       20.35
         15 |         93        0.93       21.28
         16 |        113        1.13       22.41
         17 |        126        1.26       23.67
         18 |        142        1.42       25.09
         19 |        123        1.23       26.32
         20 |        100        1.00       27.32
         21 |        122        1.22       28.54
         22 |        119        1.19       29.73
         23 |        131        1.31       31.04
         24 |          5        0.05       31.09
         99 |      6,891       68.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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