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 |        144        1.44        2.71
          2 |        107        1.07        3.78
          3 |        105        1.05        4.83
          4 |         84        0.84        5.67
          5 |         93        0.93        6.60
          6 |        112        1.12        7.72
          7 |        108        1.08        8.80
          8 |         84        0.84        9.64
          9 |        105        1.05       10.69
         10 |        115        1.15       11.84
         11 |        118        1.18       13.02
         12 |        155        1.55       14.57
         13 |        151        1.51       16.08
         14 |        162        1.62       17.70
         15 |        181        1.81       19.51
         16 |        191        1.91       21.42
         17 |        223        2.23       23.65
         18 |        222        2.22       25.87
         19 |        171        1.71       27.58
         20 |        174        1.74       29.32
         21 |        181        1.81       31.13
         22 |        125        1.25       32.38
         23 |        153        1.53       33.91
         88 |        408        4.08       37.99
         99 |      6,201       62.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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