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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        237        2.37        2.37
          1 |        236        2.36        4.73
          2 |        242        2.42        7.15
          3 |        206        2.06        9.21
          4 |        148        1.48       10.69
          5 |        146        1.46       12.15
          6 |        212        2.12       14.27
          7 |        180        1.80       16.07
          8 |        170        1.70       17.77
          9 |        185        1.85       19.62
         10 |        191        1.91       21.53
         11 |        203        2.03       23.56
         12 |        209        2.09       25.65
         13 |        244        2.44       28.09
         14 |        275        2.75       30.84
         15 |        286        2.86       33.70
         16 |        305        3.05       36.75
         17 |        298        2.98       39.73
         18 |        337        3.37       43.10
         19 |        326        3.26       46.36
         20 |        333        3.33       49.69
         21 |        339        3.39       53.08
         22 |        279        2.79       55.87
         23 |        271        2.71       58.58
         88 |        264        2.64       61.22
         99 |      3,878       38.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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