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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        366        3.66        3.66
          1 |        224        2.24        5.90
          2 |        234        2.34        8.24
          3 |        163        1.63        9.87
          4 |        124        1.24       11.11
          5 |        135        1.35       12.46
          6 |        165        1.65       14.11
          7 |        208        2.08       16.19
          8 |        164        1.64       17.83
          9 |        141        1.41       19.24
         10 |        179        1.79       21.03
         11 |        168        1.68       22.71
         12 |        205        2.05       24.76
         13 |        192        1.92       26.68
         14 |        229        2.29       28.97
         15 |        275        2.75       31.72
         16 |        275        2.75       34.47
         17 |        295        2.95       37.42
         18 |        320        3.20       40.62
         19 |        314        3.14       43.76
         20 |        288        2.88       46.64
         21 |        273        2.73       49.37
         22 |        269        2.69       52.06
         23 |        275        2.75       54.81
         24 |          6        0.06       54.87
         99 |      4,513       45.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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