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

    Arrival |
       Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        691        6.91        6.91
          1 |        237        2.37        9.28
          2 |        227        2.27       11.55
          3 |        149        1.49       13.04
          4 |        119        1.19       14.23
          5 |        117        1.17       15.40
          6 |        124        1.24       16.64
          7 |        152        1.52       18.16
          8 |        139        1.39       19.55
          9 |        116        1.16       20.71
         10 |        129        1.29       22.00
         11 |        147        1.47       23.47
         12 |        171        1.71       25.18
         13 |        158        1.58       26.76
         14 |        208        2.08       28.84
         15 |        229        2.29       31.13
         16 |        246        2.46       33.59
         17 |        247        2.47       36.06
         18 |        276        2.76       38.82
         19 |        309        3.09       41.91
         20 |        300        3.00       44.91
         21 |        279        2.79       47.70
         22 |        267        2.67       50.37
         23 |        296        2.96       53.33
         24 |          4        0.04       53.37
         99 |      4,663       46.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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