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

   not_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        324        3.24        3.24
          1 |        199        1.99        5.23
          2 |        221        2.21        7.44
          3 |        146        1.46        8.90
          4 |        115        1.15       10.05
          5 |        127        1.27       11.32
          6 |        180        1.80       13.12
          7 |        154        1.54       14.66
          8 |        123        1.23       15.89
          9 |        111        1.11       17.00
         10 |        137        1.37       18.37
         11 |        166        1.66       20.03
         12 |        191        1.91       21.94
         13 |        154        1.54       23.48
         14 |        200        2.00       25.48
         15 |        233        2.33       27.81
         16 |        225        2.25       30.06
         17 |        224        2.24       32.30
         18 |        278        2.78       35.08
         19 |        264        2.64       37.72
         20 |        265        2.65       40.37
         21 |        248        2.48       42.85
         22 |        249        2.49       45.34
         23 |        211        2.11       47.45
         24 |          3        0.03       47.48
         99 |      5,252       52.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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