Fit with error bars

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Lautibah
Posts: 47
Joined: January 5th, 2019, 12:41 pm

Fit with error bars

Post by Lautibah »

Hello.
I hope everything is OK despite the pandemic.

I wonder, since when are error bars being important on the weights of points the fitting curves? I just realized a fitting with error bars and non-error bars are different. Amazing

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MagicPlot
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Re: Fit with error bars

Post by MagicPlot »

Hello,
All is OK, thank you, and I hope that you too.

Yes, the error data is used to calculate the weights of the points while fitting. The more error you have at a point, the less weight has it point -- it is a standard least-squares algorithm technique. The exact formulas are here (automatic links are disabled in forum to reduce spam): https://magicplot.com/wiki/fit_formulas

Lautibah
Posts: 47
Joined: January 5th, 2019, 12:41 pm

Re: Fit with error bars

Post by Lautibah »

Cool, I did notice that before. Thanks.

Keep safe!

Lautibah
Posts: 47
Joined: January 5th, 2019, 12:41 pm

Re: Fit with error bars

Post by Lautibah »

Seems like error in X is not considered. As I have seen in the program + https://magicplot.com/wiki/fit_formulas
Isn't it?

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MagicPlot
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Re: Fit with error bars

Post by MagicPlot »

Hello,

Yes, X errors are not taken into account by the current fit algorithm.

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