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

 crash time |
   (minute) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        588        5.88        5.88
          1 |        100        1.00        6.88
          2 |         83        0.83        7.71
          3 |        109        1.09        8.80
          4 |        118        1.18        9.98
          5 |        355        3.55       13.53
          6 |        116        1.16       14.69
          7 |        110        1.10       15.79
          8 |        119        1.19       16.98
          9 |         75        0.75       17.73
         10 |        324        3.24       20.97
         11 |         78        0.78       21.75
         12 |        126        1.26       23.01
         13 |        100        1.00       24.01
         14 |         87        0.87       24.88
         15 |        361        3.61       28.49
         16 |         97        0.97       29.46
         17 |        138        1.38       30.84
         18 |        115        1.15       31.99
         19 |         95        0.95       32.94
         20 |        425        4.25       37.19
         21 |         88        0.88       38.07
         22 |         94        0.94       39.01
         23 |        106        1.06       40.07
         24 |        103        1.03       41.10
         25 |        369        3.69       44.79
         26 |         99        0.99       45.78
         27 |        117        1.17       46.95
         28 |        126        1.26       48.21
         29 |        100        1.00       49.21
         30 |        504        5.04       54.25
         31 |         97        0.97       55.22
         32 |        129        1.29       56.51
         33 |         98        0.98       57.49
         34 |         97        0.97       58.46
         35 |        298        2.98       61.44
         36 |        115        1.15       62.59
         37 |        106        1.06       63.65
         38 |        125        1.25       64.90
         39 |        105        1.05       65.95
         40 |        409        4.09       70.04
         41 |        101        1.01       71.05
         42 |        113        1.13       72.18
         43 |         97        0.97       73.15
         44 |        115        1.15       74.30
         45 |        386        3.86       78.16
         46 |        102        1.02       79.18
         47 |        131        1.31       80.49
         48 |        130        1.30       81.79
         49 |        113        1.13       82.92
         50 |        398        3.98       86.90
         51 |         99        0.99       87.89
         52 |        122        1.22       89.11
         53 |         96        0.96       90.07
         54 |        114        1.14       91.21
         55 |        317        3.17       94.38
         56 |         89        0.89       95.27
         57 |        107        1.07       96.34
         58 |        138        1.38       97.72
         59 |        124        1.24       98.96
         99 |        104        1.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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