I'm in a situation where I need to compare the accuracy of one stress-strain curve with respect to the other, with both curves having different x and y coordinates. If both curves have the same x-coordinates (independent variable) and varying y-coordinates (dependent variable), I could use the R squared value or the Weighted Least Squares (WLS) method.

I'm trying to avoid interpolation as there are many values and would be a very tedious task.

Any help is appreciated :)

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