E1.1 data frame has 24 rows and 2 columns.
This data frame contains the following columns:
a numeric vector, vehicles per mile.
a numeric vector, miles per hour.
Example 1.1 page 2 in Sen and Srivastava.
Huber, M.J (1957) Effect of temporary bridge on Parkway performance. Highway Research Board Bulletin 167 63–74.
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