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 |        108        1.08        5.98
          2 |        100        1.00        6.98
          3 |         89        0.89        7.87
          4 |        107        1.07        8.94
          5 |        333        3.33       12.27
          6 |        115        1.15       13.42
          7 |         98        0.98       14.40
          8 |        124        1.24       15.64
          9 |        101        1.01       16.65
         10 |        349        3.49       20.14
         11 |        113        1.13       21.27
         12 |        116        1.16       22.43
         13 |         90        0.90       23.33
         14 |        112        1.12       24.45
         15 |        381        3.81       28.26
         16 |        113        1.13       29.39
         17 |        126        1.26       30.65
         18 |        132        1.32       31.97
         19 |         98        0.98       32.95
         20 |        397        3.97       36.92
         21 |         92        0.92       37.84
         22 |        121        1.21       39.05
         23 |         96        0.96       40.01
         24 |        141        1.41       41.42
         25 |        319        3.19       44.61
         26 |        117        1.17       45.78
         27 |         89        0.89       46.67
         28 |        101        1.01       47.68
         29 |         96        0.96       48.64
         30 |        530        5.30       53.94
         31 |         95        0.95       54.89
         32 |         95        0.95       55.84
         33 |        107        1.07       56.91
         34 |        100        1.00       57.91
         35 |        337        3.37       61.28
         36 |        109        1.09       62.37
         37 |        109        1.09       63.46
         38 |        136        1.36       64.82
         39 |        113        1.13       65.95
         40 |        381        3.81       69.76
         41 |        156        1.56       71.32
         42 |         82        0.82       72.14
         43 |        129        1.29       73.43
         44 |        101        1.01       74.44
         45 |        425        4.25       78.69
         46 |        112        1.12       79.81
         47 |        122        1.22       81.03
         48 |        109        1.09       82.12
         49 |        112        1.12       83.24
         50 |        397        3.97       87.21
         51 |         87        0.87       88.08
         52 |        120        1.20       89.28
         53 |        126        1.26       90.54
         54 |        124        1.24       91.78
         55 |        302        3.02       94.80
         56 |        114        1.14       95.94
         57 |        101        1.01       96.95
         58 |        129        1.29       98.24
         59 |         78        0.78       99.02
         99 |         98        0.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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