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Armok_GoB comments on The best 15 words - Less Wrong
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I am confused, that doesn't seem to be true.
Consider a sine wave. It can be observed in a great number of phenomena, from the sound produced by a tuning fork to the plot of temperature in mid-latitudes throughout the year. All measurements which produce something resembling a sine wave are correlated. Remember that correlation (well, at least Pearson's correlation -- I assume that's what is meant here) is invariant to linear transformations so different scale is not a problem.
This is a case of a common cause, in the form of a logical fact rather than a physical one.
I don't understand this. Which logical fact is the common cause? The fact that the measurements are correlated? Doesn't the whole thing collapse into a circle, then?
The fact of the shape of a sine curve.