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

 Crash Time |
   (Minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        521        5.21        5.21
          1 |        112        1.12        6.33
          2 |        117        1.17        7.50
          3 |        112        1.12        8.62
          4 |        107        1.07        9.69
          5 |        309        3.09       12.78
          6 |         83        0.83       13.61
          7 |         88        0.88       14.49
          8 |        108        1.08       15.57
          9 |        119        1.19       16.76
         10 |        392        3.92       20.68
         11 |         89        0.89       21.57
         12 |        145        1.45       23.02
         13 |        113        1.13       24.15
         14 |        121        1.21       25.36
         15 |        419        4.19       29.55
         16 |        112        1.12       30.67
         17 |        118        1.18       31.85
         18 |        138        1.38       33.23
         19 |        103        1.03       34.26
         20 |        439        4.39       38.65
         21 |         90        0.90       39.55
         22 |         94        0.94       40.49
         23 |        113        1.13       41.62
         24 |         84        0.84       42.46
         25 |        327        3.27       45.73
         26 |         97        0.97       46.70
         27 |        101        1.01       47.71
         28 |        111        1.11       48.82
         29 |         86        0.86       49.68
         30 |        546        5.46       55.14
         31 |        100        1.00       56.14
         32 |        120        1.20       57.34
         33 |        119        1.19       58.53
         34 |        118        1.18       59.71
         35 |        313        3.13       62.84
         36 |         99        0.99       63.83
         37 |         97        0.97       64.80
         38 |        109        1.09       65.89
         39 |         92        0.92       66.81
         40 |        422        4.22       71.03
         41 |         78        0.78       71.81
         42 |        108        1.08       72.89
         43 |        101        1.01       73.90
         44 |         86        0.86       74.76
         45 |        394        3.94       78.70
         46 |         78        0.78       79.48
         47 |        120        1.20       80.68
         48 |        113        1.13       81.81
         49 |        104        1.04       82.85
         50 |        443        4.43       87.28
         51 |         88        0.88       88.16
         52 |         95        0.95       89.11
         53 |        135        1.35       90.46
         54 |        119        1.19       91.65
         55 |        291        2.91       94.56
         56 |         86        0.86       95.42
         57 |        135        1.35       96.77
         58 |        107        1.07       97.84
         59 |        113        1.13       98.97
         99 |        103        1.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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