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How to determine the order of a set of data? (AR coefficient)

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HF
HF on 21 Oct 2020
Edited: HF on 21 Oct 2020
Hello, I am trying to use the Matlab function pyulear. Therefore, I need to determine the order of my set of data. How can I do this? I was thinking of using the function n4sid, but it does not work at all.
My code:
m = n4sid(Signal, 1:10);
order = idpoly(m)
[X, Y] = pyulear(Signal,order,length(Signal),Fs);

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