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

Notificatio |
     n Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        686        6.86        6.86
          1 |        113        1.13        7.99
          2 |         80        0.80        8.79
          3 |         51        0.51        9.30
          4 |         28        0.28        9.58
          5 |         26        0.26        9.84
          6 |         24        0.24       10.08
          7 |         35        0.35       10.43
          8 |         23        0.23       10.66
          9 |         20        0.20       10.86
         10 |         34        0.34       11.20
         11 |         35        0.35       11.55
         12 |         41        0.41       11.96
         13 |         44        0.44       12.40
         14 |         47        0.47       12.87
         15 |         64        0.64       13.51
         16 |         62        0.62       14.13
         17 |         82        0.82       14.95
         18 |         91        0.91       15.86
         19 |         79        0.79       16.65
         20 |         76        0.76       17.41
         21 |         81        0.81       18.22
         22 |         98        0.98       19.20
         23 |         91        0.91       20.11
         99 |      7,989       79.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016