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nonlinear regression

Apr 25, 2011 3:40 PM
(1739 views)

What should I do if after I run the nonlinear regression and the following message appears on the control panel:

"Consider looser convergence criteria or selec "accept current estimates" under "iteration options".

Failed: Cannot decrease objective function

"Consider looser convergence criteria or selec "accept current estimates" under "iteration options".

Failed: Cannot decrease objective function

3 REPLIES 3

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Re: nonlinear regression

I have also received this message: Failed: Cannot Decrease Objective Function

when running a logistic regression. I am not sure what this means or how to fix this problem; I've run many logistic regressions and never received this error message before.

Thanks for any insight you might have!

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Re: nonlinear regression

The Nonlinear platform is very powerful and versatile. It has many options. Therefore, there are many reasons why you might get such an error message. The objective function, which could be many different functions, is monitored as the parameter estimates are updated. Since the function did not change (decrease), it cannot tell if it converged. So it would help if you could describe the nature of your

- predictor variable
- response vairable
- model (column formula)
- starting values

Otherwise it is difficult to provide you a useful answer.

Learn it once, use it forever!

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Re: nonlinear regression

Did you try one of the suggestions? In particular, did you accept the current estimates and examine the fitted model to see if it was acceptable?

Learn it once, use it forever!