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Why this total residual error shows 0.5?

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Spreadea
Spreadea on 17 Dec 2019
Edited: Spreadea on 17 Dec 2019
I confirm the function 'findchangepts' following code.
findchangepts([0 1 2],'MinThreshold',0.5)
this result shows total residual error = 0.5. But, in my understanding, each points of residual error are 0, -0.5, +0.5, so the total residual error is 0. Because the values of residual error is each points to red line.
Could you explain me why this total residual value is 0.5?

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Accepted Answer

Shunichi Kusano
Shunichi Kusano on 17 Dec 2019
Hi Kazuki,
as described in the documentation, it is "the sum of the residual (squared) error".
Hence, in this case, 0^2 + (+0.5)^2 + (-0.5)^2 = 0.5.
HTH.

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Spreadea
Spreadea on 17 Dec 2019
I see,I just miss understanding. Thank you very much answer for me!!

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