Effacer les filtres
Effacer les filtres

fitnlm problem- the SE is very small

1 vue (au cours des 30 derniers jours)
W_Elsa
W_Elsa le 25 Jan 2019
Hello all, I am using 'fitnlm' to fit a non-linear model, however, the SE in mdl.Coeffficients is very small, in the order of e-16~e-30.
E{7Q`2A20)@LD1R`_4B18_U.png
The model for sure cannot fit perfectly to the data, if I feed the data into the curve fitting toolbox using the same initial value, I can get reasonable boundary for the model coefficients.
General model:
f(x) = 1-a*x^b-c*x^d
Coefficients (with 95% confidence bounds):
a = 0.002713 (0.001471, 0.003956)
b = 0.6173 (0.5348, 0.6998)
c = 9.554e-20 (-6.96e-19, 8.871e-19)
d = 6.375 (5.121, 7.629)
Their goodness of fittting are both good.
Did anyone meet similar problems? Thank you.

Connectez-vous pour répondre à cette question.

Réponses (0)

Catégories

En savoir plus sur Interpolation dans Help Center et File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by