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ggplot2-exts / ggplot2-exts.github.io

A list of ggplot2 extensions
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ggpmisc: plotting linear regression equation forced through the origin #38

Closed wraseman closed 5 years ago

wraseman commented 5 years ago

Hello and thanks for your work on ggpmisc!

I ran into a small issue when trying to plot a linear regression equation forced through the origin.

I have a dataframe that looks like this... image

I'm trying to create a scatterplot of Total Hardness vs. Calcium Hardness and the linear regression equation on the plot with R^2. Using stat_poly_eq() I am very close but can't get the equation quite right.

image

The equation reads "yhat = 0.267" (see above) when it should read "yhat = 0.267x". It works when I don't force the equation through the origin but not when I do. Don't know if this is a bug or my lack of familiarity with the syntax.

Thanks!

Emaasit commented 5 years ago

@wraseman The best place to file this issue is at the respective package website: https://docs.r4photobiology.info/ggpmisc/. The author of the package is @aphalo Pedro J. Aphalo (pedro.aphalo@helsinki.fi).