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?

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

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