# How to apply linear least squares fit for two entities?

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Amjad Iqbal 2022 年 7 月 24 日
コメント済み: Matt J 2022 年 7 月 25 日
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.
Thank you!
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dpb 2022 年 7 月 24 日
That certainly doesn't look to be nonlinear. What's the functional form you think you should be fitting (a literature reference to the type of data/from whencecame the above figure, maybe???)
Amjad Iqbal 2022 年 7 月 24 日
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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### 採用された回答

Matt J 2022 年 7 月 24 日
You can do a total least squares fit using linear2dFit() from,
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Amjad Iqbal 2022 年 7 月 24 日
I tried but this doesn't apply, if you may chech with my attached datasets will be helpful.
Matt J 2022 年 7 月 25 日
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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