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

    Arrival |
   Time EMS |
     (HOUR) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        175        1.75        1.75
          1 |        208        2.08        3.83
          2 |        186        1.86        5.69
          3 |        165        1.65        7.34
          4 |        126        1.26        8.60
          5 |        152        1.52       10.12
          6 |        186        1.86       11.98
          7 |        185        1.85       13.83
          8 |        154        1.54       15.37
          9 |        160        1.60       16.97
         10 |        166        1.66       18.63
         11 |        184        1.84       20.47
         12 |        180        1.80       22.27
         13 |        213        2.13       24.40
         14 |        231        2.31       26.71
         15 |        254        2.54       29.25
         16 |        259        2.59       31.84
         17 |        250        2.50       34.34
         18 |        304        3.04       37.38
         19 |        281        2.81       40.19
         20 |        288        2.88       43.07
         21 |        283        2.83       45.90
         22 |        239        2.39       48.29
         23 |        214        2.14       50.43
         88 |        373        3.73       54.16
         99 |      4,584       45.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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