Figure 11.19 shows the pressure difference between two sensors on a steel plate exposed to a…

Figure 11.19 shows the pressure difference between two sensors on a steel plate exposed to a powerful air blast [342]. There are 161 observations during a period just before and after the blast. The noise in Figure 11.19 is attributable to inadequate temporal resolution and to error in the sensors and recording equipment; the underlying physical shock waves that generate these data are smooth. These data are available from the website for this book.

a. Construct a running-line smooth of these data, with span chosen by eye.

Figure 11.19 shows the pressure difference between two sensors on a steel plate exposed to a...

b. Make a plot of CVRSSk(sˆk) versus k for k ∈ {3, 5, 7, 11, 15, 20, 30, 50}. Comment.

c. Produce the most appealing smooth you can for these data, using any smoother and span you wish. Why do you like it?

d. Comment on difficulties of smoothing and span selection for these data.

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