Hi guys, so I've been researching sleep studies and I've been looking at comparison on devices used, and most of them seem to obtain a magnitude value based on the acceleration seen on the device by the user.(adsbygoogle = window.adsbygoogle || []).push({});

What I'm wondering about though is that the comparison between devices seem to be using the Pearson Correlation.

Example:

http://www.journalsleep.org/Articles/290214.pdf

http://www.sciencedirect.com/science/article/pii/S0165027000003642

http://www.itc-ltd.co.jp/pdf/Kushida_et_al.pdf

But from what I read, the Pearson correlation only works with linear correlations, while I would assume the values based here would be quite random values, and while I would imagine there is a correlation say between the devices, I wouldn't imagine it to be linear which I thought was what the Pearson correlation needed?

Am I wrong? I will admit, I don't understand the correlation when I tried to read up on it.

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# Pearson Correlation in Sleep Studies

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