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Thread Subject: Auto Regress Function ARX

Subject: Auto Regress Function ARX

From: CandyGirl

Date: 8 Jun, 2008 12:00:52

Message: 1 of 1

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Hiya,

I know this s a little 'mathematical' rather than matlab oriented but any input would be appreceated;

I'm using the ARX function on a set of polynomial coefficients [1+a1z^-1,...,anz^-n, 0,b1z^-1,...,bnz^-n] to approximate a transfer function. I often wonder why the denominator coefficients are always more acurately approximated than the numerator?

Is there some theory about this that i'm carelessly missing?

Thank you

Thank you

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