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

 Crash Time |
   (Minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        527        5.27        5.27
          1 |        115        1.15        6.42
          2 |        131        1.31        7.73
          3 |        104        1.04        8.77
          4 |        121        1.21        9.98
          5 |        304        3.04       13.02
          6 |         90        0.90       13.92
          7 |        101        1.01       14.93
          8 |        116        1.16       16.09
          9 |        112        1.12       17.21
         10 |        331        3.31       20.52
         11 |         93        0.93       21.45
         12 |        143        1.43       22.88
         13 |        113        1.13       24.01
         14 |        139        1.39       25.40
         15 |        390        3.90       29.30
         16 |        119        1.19       30.49
         17 |        125        1.25       31.74
         18 |        146        1.46       33.20
         19 |        110        1.10       34.30
         20 |        403        4.03       38.33
         21 |        106        1.06       39.39
         22 |        107        1.07       40.46
         23 |         99        0.99       41.45
         24 |        108        1.08       42.53
         25 |        298        2.98       45.51
         26 |        120        1.20       46.71
         27 |        106        1.06       47.77
         28 |        118        1.18       48.95
         29 |         93        0.93       49.88
         30 |        534        5.34       55.22
         31 |         97        0.97       56.19
         32 |        120        1.20       57.39
         33 |        113        1.13       58.52
         34 |        127        1.27       59.79
         35 |        282        2.82       62.61
         36 |        112        1.12       63.73
         37 |        103        1.03       64.76
         38 |        125        1.25       66.01
         39 |        101        1.01       67.02
         40 |        377        3.77       70.79
         41 |        100        1.00       71.79
         42 |        114        1.14       72.93
         43 |        102        1.02       73.95
         44 |        107        1.07       75.02
         45 |        349        3.49       78.51
         46 |         99        0.99       79.50
         47 |        127        1.27       80.77
         48 |        140        1.40       82.17
         49 |        110        1.10       83.27
         50 |        373        3.73       87.00
         51 |         91        0.91       87.91
         52 |        107        1.07       88.98
         53 |        132        1.32       90.30
         54 |        134        1.34       91.64
         55 |        284        2.84       94.48
         56 |         92        0.92       95.40
         57 |        119        1.19       96.59
         58 |        120        1.20       97.79
         59 |        102        1.02       98.81
         99 |        119        1.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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