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

    Arrival |
       Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        855        8.55        8.55
          1 |        199        1.99       10.54
          2 |        195        1.95       12.49
          3 |        118        1.18       13.67
          4 |         82        0.82       14.49
          5 |         91        0.91       15.40
          6 |        136        1.36       16.76
          7 |        126        1.26       18.02
          8 |        112        1.12       19.14
          9 |         85        0.85       19.99
         10 |        118        1.18       21.17
         11 |        129        1.29       22.46
         12 |        150        1.50       23.96
         13 |        139        1.39       25.35
         14 |        178        1.78       27.13
         15 |        223        2.23       29.36
         16 |        207        2.07       31.43
         17 |        226        2.26       33.69
         18 |        234        2.34       36.03
         19 |        254        2.54       38.57
         20 |        232        2.32       40.89
         21 |        247        2.47       43.36
         22 |        225        2.25       45.61
         23 |        254        2.54       48.15
         99 |      5,185       51.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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