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

Notificatio |
 n Time EMS |
     (HOUR) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        127        1.27        1.27
          1 |        120        1.20        2.47
          2 |        143        1.43        3.90
          3 |        106        1.06        4.96
          4 |         82        0.82        5.78
          5 |        100        1.00        6.78
          6 |        159        1.59        8.37
          7 |        128        1.28        9.65
          8 |        122        1.22       10.87
          9 |        130        1.30       12.17
         10 |        138        1.38       13.55
         11 |        122        1.22       14.77
         12 |        185        1.85       16.62
         13 |        144        1.44       18.06
         14 |        195        1.95       20.01
         15 |        186        1.86       21.87
         16 |        218        2.18       24.05
         17 |        173        1.73       25.78
         18 |        192        1.92       27.70
         19 |        221        2.21       29.91
         20 |        202        2.02       31.93
         21 |        182        1.82       33.75
         22 |        145        1.45       35.20
         23 |        139        1.39       36.59
         88 |        388        3.88       40.47
         99 |      5,953       59.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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