using least square fit to find the best fit parameters

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Annie Ng 2020-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/507593-using-least-square-fit-to-find-the-best-fit-parameters

回答： Alex Sha 2020-2-26

I have 3 variables y, x1, and x2 stored in vector form. I know that y=f(x1,x2) and has the form y = a*b*x1/(1+b*x1+c*x2) + d*x1. a,b,c, and d are parameters. How can I use lsqnonlin to find a,b,c,d?

Thank you

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Annie Ng 2020-2-26

is there any other way that I can find the parameters?

Rik 2020-2-26

You could try with a different fitting function or with different initial guesses. Those two will only help if your function properly describes the trend in your data and if your data isn't noisy in the first place.

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