How to find uncertainties in the coefficients of polyfit

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Chris Martin 2014-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/164045-how-to-find-uncertainties-in-the-coefficients-of-polyfit

回答： Star Strider 2024-1-4

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Answer 1

aneps 2014-11-24

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编辑：aneps 2014-11-24

在 MATLAB Online 中打开

Try this:

 [P,S,MU] = polyfit(x,y,N)
 [y,DELTA] = polyval(P,x,S,MU) % this will give you the error

Refer: http://www.mathworks.com/help/matlab/ref/polyfit.html http://www.mathworks.com/help/matlab/ref/polyval.html

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Chris Martin 2014-11-25

actually i need the uncertainty associated with the determination of coefficients, ie i need the uncertainty associated with m, of y=mx+c

Riccardo 2022-10-8

I too am looking for an answer to this!

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Answer 2

Star Strider 2024-1-4

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An earlier version of my polyparci function already existed when this question originally posted. It calculates the confidence intervals on each parameter.

I just uploaded a significant upgrade to the original version that now additionally returns the probabilities for each parameter.

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How to find uncertainties in the coefficients of polyfit

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How to find uncertainties in the coefficients of polyfit

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