How is R-square calculated in curve fitting tool for LAR and bisqaure robust fit option?
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I find that for a polynomial fit with Bisquare or LAR robust fit option, the r-square value I calculate doesn't match with the curve fitting tool result. does the curve fitting tool use a different formulation than the one explained in here?
please help.
2 commentaires
Rik
le 20 Déc 2019
Try to make a MWE so we can run your code without any other dependencies and can reproduce your issue. That would help to determine if there is a float rounding error, a bug in your code, or a bug in Matlab.
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ME
le 20 Déc 2019
Does this link help at all?
It looks like LAR doesn't so much minimise an R^2 value but rather minimises the absolute differences. Could that be your issue and why they don't match?
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Junxi Zhang
le 3 Fév 2020
LAR minimize the absolute differences, so the fitted model using LAR has different coefficients. That's easy to understand.
However, if we use function "fit" with LAR in command line as well as app "curve fitting tool", the coefficients are the same but the goodness of fit is different. That is to say, SSE, R-sqaure and RMSE are much better in app "curve fitting tool" than in function "fit", which is the same as values calculated manually.
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