Getting errors in fitnlm

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M. Sarim Ameed Khan
评论： M. Sarim Ameed Khan 2021-10-11
I am trying to fit an equation fitnlm I am getting following errors and the data is fitting but not giving the desired values of coeffeceints. I have taken several values for first estimate of first coeffeceint.
Warning: The Jacobian at the solution is ill-conditioned, and some model parameters may not be
estimated well (they are not identifiable). Use caution in making predictions.
> In nlinfit (line 384)
In NonLinearModel/fitter (line 1127)
In classreg.regr/FitObject/doFit (line 94)
In NonLinearModel.fit (line 1446)
In fitnlm (line 99)
In PH307_assignment02_3 (line 26)
Thanks for help in advance. Sorry for inconvenience.

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Prateek Rai
Prateek Rai 2021-10-9
To my understanding, you are trying to fit an equation using fitnlm and getting "The Jacobian at the solution is ill-conditioned ..." warning message.
You can refer to the following MATLAB Answer, that provides detailed information on this warning.

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