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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        408        4.08        4.08
          1 |        199        1.99        6.07
          2 |        224        2.24        8.31
          3 |        165        1.65        9.96
          4 |        107        1.07       11.03
          5 |        127        1.27       12.30
          6 |        184        1.84       14.14
          7 |        152        1.52       15.66
          8 |        129        1.29       16.95
          9 |        158        1.58       18.53
         10 |        143        1.43       19.96
         11 |        170        1.70       21.66
         12 |        166        1.66       23.32
         13 |        170        1.70       25.02
         14 |        220        2.20       27.22
         15 |        226        2.26       29.48
         16 |        240        2.40       31.88
         17 |        233        2.33       34.21
         18 |        266        2.66       36.87
         19 |        282        2.82       39.69
         20 |        288        2.88       42.57
         21 |        272        2.72       45.29
         22 |        238        2.38       47.67
         23 |        238        2.38       50.05
         24 |          1        0.01       50.06
         99 |      4,994       49.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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