cftool weights given errors for y-data

Question

Giorgio Nissardi 2019-12-26

1
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https://ww2.mathworks.cn/matlabcentral/answers/498124-cftool-weights-given-errors-for-y-data

回答： Shubh Sahu 2019-12-30

I am using cftool for some exponential fits. I have errors for every y-data of my fit. How can I calculate the weights for a weighted fit using these errors? I was thinking that the weight is something like the inverse of the error but to be completly onest I don't know exatly what cftool requires as a weight to do a good fit

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Answer 1

Shubh Sahu 2019-12-30

1
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https://ww2.mathworks.cn/matlabcentral/answers/498124-cftool-weights-given-errors-for-y-data#answer_408158

In the first iteration fit your data with given method you want. Then calclaute weights by reciprocating residue and save that weights in workspace, the more the residue the less will be weights. In next iteration that weights will help you to get good fit.