Extrapolate best-fit line

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Marisabel Gonzalez
回答： Torsten 2019-2-7
Hello,
This is a section of one of my plots. I am estimating the slope of the "crosses data", i.e. the star is not included in that estimation (I am just using it as a reference value). I want to show that my best fit of the crosses also passes through that star. How can I extrapolate this without having to include the star in my estimate? Thanks
Screen Shot 2019-02-07 at 10.03.41.png

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Torsten
Torsten 2019-2-7
If you have the coefficients c(1) and c(2) of the fit line l(x)=c(1)+c(2)*x, just evaluate the equation at the x-coordinate of the star point and compare with the y-coordinate of the star point.

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