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

 crash time |
   (minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        490        4.90        4.90
          1 |        126        1.26        6.16
          2 |         95        0.95        7.11
          3 |        116        1.16        8.27
          4 |         89        0.89        9.16
          5 |        289        2.89       12.05
          6 |        111        1.11       13.16
          7 |        132        1.32       14.48
          8 |        102        1.02       15.50
          9 |        108        1.08       16.58
         10 |        331        3.31       19.89
         11 |        128        1.28       21.17
         12 |        139        1.39       22.56
         13 |         92        0.92       23.48
         14 |        133        1.33       24.81
         15 |        426        4.26       29.07
         16 |         85        0.85       29.92
         17 |        113        1.13       31.05
         18 |        148        1.48       32.53
         19 |         99        0.99       33.52
         20 |        402        4.02       37.54
         21 |        104        1.04       38.58
         22 |        143        1.43       40.01
         23 |        113        1.13       41.14
         24 |        128        1.28       42.42
         25 |        341        3.41       45.83
         26 |         93        0.93       46.76
         27 |        129        1.29       48.05
         28 |        118        1.18       49.23
         29 |         83        0.83       50.06
         30 |        509        5.09       55.15
         31 |         94        0.94       56.09
         32 |        106        1.06       57.15
         33 |        102        1.02       58.17
         34 |         97        0.97       59.14
         35 |        312        3.12       62.26
         36 |         77        0.77       63.03
         37 |         91        0.91       63.94
         38 |        142        1.42       65.36
         39 |         98        0.98       66.34
         40 |        380        3.80       70.14
         41 |         73        0.73       70.87
         42 |        115        1.15       72.02
         43 |        101        1.01       73.03
         44 |         97        0.97       74.00
         45 |        422        4.22       78.22
         46 |        116        1.16       79.38
         47 |        111        1.11       80.49
         48 |        116        1.16       81.65
         49 |         93        0.93       82.58
         50 |        432        4.32       86.90
         51 |         94        0.94       87.84
         52 |        116        1.16       89.00
         53 |        131        1.31       90.31
         54 |         87        0.87       91.18
         55 |        322        3.22       94.40
         56 |        111        1.11       95.51
         57 |        132        1.32       96.83
         58 |        143        1.43       98.26
         59 |         91        0.91       99.17
         99 |         83        0.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016