How to find uncertainties in the coefficients of polyfit

2014 11 24
2 个回答
更新时间：2024 1 4
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回答（2 个）

Star Strider
Star Strider 2024-1-4

1 个投票

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.
aneps
aneps 2014-11-24
编辑：aneps 2014-11-24

0 个投票

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
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
Riccardo 2022-10-8
I too am looking for an answer to this!

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