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I like the idea of share of time spent at each position. Why did he give up on that approach?

Sure, it might be correlated with physique, but from my skimming of the video he had some techniques to deal with heavily correlated variables.

I didn't catch his reason for switching. Maybe it was too noisy.

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400 data points is a pretty small sample size for this kind of high dimensional analysis

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I didn't catch the sample size. Power was my other thought. If those five categorical variables can be closely approximated by one, then collapsing them is pretty valuable.

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