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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        296        2.96        2.96
          1 |        188        1.88        4.84
          2 |        212        2.12        6.96
          3 |        128        1.28        8.24
          4 |        125        1.25        9.49
          5 |        137        1.37       10.86
          6 |        192        1.92       12.78
          7 |        172        1.72       14.50
          8 |        117        1.17       15.67
          9 |        130        1.30       16.97
         10 |        157        1.57       18.54
         11 |        163        1.63       20.17
         12 |        174        1.74       21.91
         13 |        203        2.03       23.94
         14 |        244        2.44       26.38
         15 |        244        2.44       28.82
         16 |        220        2.20       31.02
         17 |        253        2.53       33.55
         18 |        267        2.67       36.22
         19 |        293        2.93       39.15
         20 |        253        2.53       41.68
         21 |        265        2.65       44.33
         22 |        214        2.14       46.47
         23 |        221        2.21       48.68
         24 |          4        0.04       48.72
         99 |      5,128       51.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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