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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        356        3.56        3.56
          1 |        166        1.66        5.22
          2 |        212        2.12        7.34
          3 |        129        1.29        8.63
          4 |         94        0.94        9.57
          5 |        117        1.17       10.74
          6 |        189        1.89       12.63
          7 |        176        1.76       14.39
          8 |        124        1.24       15.63
          9 |        127        1.27       16.90
         10 |        152        1.52       18.42
         11 |        172        1.72       20.14
         12 |        192        1.92       22.06
         13 |        207        2.07       24.13
         14 |        206        2.06       26.19
         15 |        264        2.64       28.83
         16 |        251        2.51       31.34
         17 |        227        2.27       33.61
         18 |        273        2.73       36.34
         19 |        276        2.76       39.10
         20 |        268        2.68       41.78
         21 |        250        2.50       44.28
         22 |        234        2.34       46.62
         23 |        244        2.44       49.06
         24 |          1        0.01       49.07
         99 |      5,093       50.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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