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

notificatio |
 n time ems |
     (hour) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        101        1.01        1.01
          1 |        101        1.01        2.02
          2 |         79        0.79        2.81
          3 |         64        0.64        3.45
          4 |         63        0.63        4.08
          5 |         74        0.74        4.82
          6 |        105        1.05        5.87
          7 |        108        1.08        6.95
          8 |         68        0.68        7.63
          9 |         95        0.95        8.58
         10 |         90        0.90        9.48
         11 |        103        1.03       10.51
         12 |        103        1.03       11.54
         13 |        114        1.14       12.68
         14 |        123        1.23       13.91
         15 |        148        1.48       15.39
         16 |        145        1.45       16.84
         17 |        164        1.64       18.48
         18 |        152        1.52       20.00
         19 |        143        1.43       21.43
         20 |        168        1.68       23.11
         21 |        146        1.46       24.57
         22 |        121        1.21       25.78
         23 |         88        0.88       26.66
         88 |         85        0.85       27.51
         99 |      7,249       72.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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