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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        332        3.32        3.32
          1 |        199        1.99        5.31
          2 |        217        2.17        7.48
          3 |        140        1.40        8.88
          4 |        105        1.05        9.93
          5 |        150        1.50       11.43
          6 |        191        1.91       13.34
          7 |        188        1.88       15.22
          8 |        161        1.61       16.83
          9 |        147        1.47       18.30
         10 |        153        1.53       19.83
         11 |        200        2.00       21.83
         12 |        180        1.80       23.63
         13 |        211        2.11       25.74
         14 |        231        2.31       28.05
         15 |        277        2.77       30.82
         16 |        251        2.51       33.33
         17 |        257        2.57       35.90
         18 |        257        2.57       38.47
         19 |        258        2.58       41.05
         20 |        294        2.94       43.99
         21 |        249        2.49       46.48
         22 |        213        2.13       48.61
         23 |        227        2.27       50.88
         24 |          3        0.03       50.91
         99 |      4,909       49.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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