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

    Arrival |
       Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        657        6.57        6.57
          1 |        232        2.32        8.89
          2 |        234        2.34       11.23
          3 |        142        1.42       12.65
          4 |        101        1.01       13.66
          5 |        100        1.00       14.66
          6 |        139        1.39       16.05
          7 |        171        1.71       17.76
          8 |        133        1.33       19.09
          9 |        151        1.51       20.60
         10 |        127        1.27       21.87
         11 |        145        1.45       23.32
         12 |        153        1.53       24.85
         13 |        162        1.62       26.47
         14 |        194        1.94       28.41
         15 |        244        2.44       30.85
         16 |        231        2.31       33.16
         17 |        247        2.47       35.63
         18 |        244        2.44       38.07
         19 |        222        2.22       40.29
         20 |        237        2.37       42.66
         21 |        261        2.61       45.27
         22 |        254        2.54       47.81
         23 |        239        2.39       50.20
         24 |          4        0.04       50.24
         99 |      4,976       49.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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