How to apply linear least squares fit for two entities?

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Dear Researchers,
I have two entities namely sigma (dB) and U (m/s) respectively. As given in attach figure, a linear least squares is used to fit among two entities. I have attached .mat files which contains sigma and U values. I need to fit this curve to analyse Bias and RMS.
I lookforward to receive your valubale suggestions.
Thank you!
  2 Comments
Amjad Iqbal
Amjad Iqbal on 24 Jul 2022
As a matter of fact, I have sigma_VH from product and using equation-1 given in reference to obtain U.
In Fig-1 (d), this fit is applied among Sigma_VH and U. According to what they claim is nonlinear. However, I tired is linear. As you can see in attached result.
What's your suggetions and how to fit line among these two?

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Accepted Answer

Matt J
Matt J on 24 Jul 2022
  2 Comments
Matt J
Matt J on 25 Jul 2022
Works fine for me
>> fobj=linear2dFit([U_vh1(:)';sigma_o_VH1(:).'])
fobj =
linear2dFit with properties:
p1: [4.7831 -27.4053]
p2: [9.1807 -19.8232]

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