[mohsen-ebrahimian]

hi
in APS estimation step , the value of polynomial order is selective.
What is it’s application?
What happens when we put polynomial order in a number greater than one?
thanks for response
best

[periz]

polynomial order = 2
it means you estimate a and b where
phi = a*t + b*t^2
polynomial order = 3
phi = a*t + b*t^2 + c*t^3
phi is phase, t time
best

[antig]

Does it mean that if I will put polynomal order 2 then estimated model is no longer linear but parbolic?

Then it is useful?

[periz]

yes
usually the non-linear non-parametric model (smart option) works better. However, there could be very specific and particular situations where a polynomial model could be better. It depends on the case. Generally, if you have to go non-linear, I would suggest the smart option

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