Error model with curve-fitting
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Can I use one of the error models in Simbiology (constant/proportional/combined) while estimating parameters in MATLAB? I am using lsqnonlin for curvefitting and estimating the parameters. How can I incorporate a constant error function with it?
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Arthur Goldsipe
2019-10-9
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SimBiology's error models are only available when fitting data to SimBiology models using functions like sbiofit. If you are directly calling lsqnonlin, then you are probably doing "traditional" nonlinear least-squares regression, which is equivalent to a constant error model. It is possible to adapt lsqnonlin for other error models, but it requires a fair amount of work. If you can't use sbiofit, then I would recommend using fitnlm (or perhaps nlinfit), if you have a license for Statistics and Machine Learning Toolbox. Both of these functions support proportional and combined error models.
3 个评论
Minu Pilvankar
2019-10-9
Arthur Goldsipe
2019-10-9
Since I'm a developer on the SimBiology team, my other recommendation would be to use SimBiology. :-)
If that's not possible, you can take a look here to see how sbiofit reformulates other error models into a form that can be used with lsqnonlin.
Minu Pilvankar
2019-10-10
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