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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        268        2.68        2.68
          1 |        179        1.79        4.47
          2 |        180        1.80        6.27
          3 |        123        1.23        7.50
          4 |        108        1.08        8.58
          5 |        133        1.33        9.91
          6 |        156        1.56       11.47
          7 |        162        1.62       13.09
          8 |        126        1.26       14.35
          9 |        157        1.57       15.92
         10 |        133        1.33       17.25
         11 |        187        1.87       19.12
         12 |        184        1.84       20.96
         13 |        193        1.93       22.89
         14 |        238        2.38       25.27
         15 |        232        2.32       27.59
         16 |        253        2.53       30.12
         17 |        242        2.42       32.54
         18 |        252        2.52       35.06
         19 |        250        2.50       37.56
         20 |        257        2.57       40.13
         21 |        262        2.62       42.75
         22 |        216        2.16       44.91
         23 |        207        2.07       46.98
         24 |          2        0.02       47.00
         99 |      5,300       53.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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