Of Infrequent Events

This exercise uses the program Rayleigh to detect periodicity in a sequence of infrequent events. As explained in Section 3.3, the program uses the Rayleigh test to determine whether events are significantly concentrated around a single time of day.

1. Double-click on the Circadian icon to open the program banner, then click on Rayleigh (the sixth program from the left).

2. The program is very simple and does not require data files. Simply type in the values.

3. Suppose you live by the beach and spend a lot of time just watching the ocean. For the last week, you wrote down the times when you saw a ship sailing by in the horizon. Your records look like this:

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