sarproz-group

polynomial order

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    • #3541
      mohsen-ebrahimian
      Participant

        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

      • #3544
        periz
        Keymaster

          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

        • #3547
          antig
          Participant

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

            Then it is useful?

          • #3548
            periz
            Keymaster

              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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