Fit with error bars

[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

[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]

Cool, I did notice that before. Thanks.

Keep safe!

[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?

[MagicPlot]

Hello,

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