Which splits should we consider?

As you proceed to quantitatively analyze the zigzag effect in the 1500 m, which splits should you include in our analysis? For reference, the plot of the zigzag effect from the video is shown to the right.

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You should include all splits, so as not to neglect useful data.
You should only include even splits (100 m, 200 m, …) because you can compare swimmers in lanes 1-3 going against the putative current and swimmers in lanes 6-8 going with the putative current.
You should include all splits except the first two and the last two. You should neglect the last two because swimmers stop pacing themselves and "kick" for the final stretch. The first two are different because they involve jumping off the starting blocks and more underwater swimming than others.

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Which splits should we consider?

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