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

Notificatio |
     n Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        740        7.40        7.40
          1 |        215        2.15        9.55
          2 |        213        2.13       11.68
          3 |        127        1.27       12.95
          4 |         92        0.92       13.87
          5 |         90        0.90       14.77
          6 |        124        1.24       16.01
          7 |        112        1.12       17.13
          8 |         95        0.95       18.08
          9 |         72        0.72       18.80
         10 |        111        1.11       19.91
         11 |        124        1.24       21.15
         12 |        121        1.21       22.36
         13 |        135        1.35       23.71
         14 |        151        1.51       25.22
         15 |        153        1.53       26.75
         16 |        189        1.89       28.64
         17 |        185        1.85       30.49
         18 |        238        2.38       32.87
         19 |        263        2.63       35.50
         20 |        255        2.55       38.05
         21 |        236        2.36       40.41
         22 |        235        2.35       42.76
         23 |        248        2.48       45.24
         24 |          2        0.02       45.26
         99 |      5,474       54.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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