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

   arr_hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        298        2.98        2.98
          1 |        205        2.05        5.03
          2 |        216        2.16        7.19
          3 |        139        1.39        8.58
          4 |        120        1.20        9.78
          5 |        162        1.62       11.40
          6 |        206        2.06       13.46
          7 |        206        2.06       15.52
          8 |        168        1.68       17.20
          9 |        139        1.39       18.59
         10 |        140        1.40       19.99
         11 |        188        1.88       21.87
         12 |        179        1.79       23.66
         13 |        231        2.31       25.97
         14 |        239        2.39       28.36
         15 |        259        2.59       30.95
         16 |        296        2.96       33.91
         17 |        258        2.58       36.49
         18 |        267        2.67       39.16
         19 |        276        2.76       41.92
         20 |        286        2.86       44.78
         21 |        273        2.73       47.51
         22 |        270        2.70       50.21
         23 |        251        2.51       52.72
         24 |          2        0.02       52.74
         99 |      4,726       47.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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