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

Notificatio |
     n Time |
   EMS-Hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        718        7.18        7.18
          1 |        113        1.13        8.31
          2 |         76        0.76        9.07
          3 |         63        0.63        9.70
          4 |         26        0.26        9.96
          5 |         32        0.32       10.28
          6 |         41        0.41       10.69
          7 |         42        0.42       11.11
          8 |         38        0.38       11.49
          9 |         28        0.28       11.77
         10 |         38        0.38       12.15
         11 |         42        0.42       12.57
         12 |         56        0.56       13.13
         13 |         39        0.39       13.52
         14 |         65        0.65       14.17
         15 |         54        0.54       14.71
         16 |         71        0.71       15.42
         17 |         73        0.73       16.15
         18 |         91        0.91       17.06
         19 |         90        0.90       17.96
         20 |         77        0.77       18.73
         21 |         87        0.87       19.60
         22 |         95        0.95       20.55
         23 |         74        0.74       21.29
         24 |          3        0.03       21.32
         99 |      7,868       78.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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