How to find uncertainties in the coefficients of polyfit

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Chris Martin
Chris Martin le 24 Nov 2014
Réponse apportée : Star Strider le 4 Jan 2024
How to find uncertainties in the coefficients of polyfit

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aneps
aneps le 24 Nov 2014
Modifié(e) : aneps le 24 Nov 2014
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
  2 commentaires
Chris Martin
Chris Martin le 25 Nov 2014
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 le 8 Oct 2022
I too am looking for an answer to this!

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Star Strider
Star Strider le 4 Jan 2024
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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