# Add mean points and confidence ellipses Key R functions: stat_chull(), stat_conf_ellipse() and stat_mean() : # Convex hull of groups Instead of drawing the concentration ellipse, you can: i) plot a convex hull of a set of points ii) add the mean points and the confidence ellipse of each group. Stat_ellipse(aes(color = cyl), type = "t")+ level: The confidence level at which to draw an ellipse (default is 0.95), or, if type=“euclid”, the radius of the circle to be drawn.“euclid” draws a circle with the radius equal to level, representing the euclidean distance from the center. The default “t” assumes a multivariate t-distribution, and “norm” assumes a multivariate normal distribution. Add concentration ellipse around groups.Geom_smooth(aes(color = cyl, fill = cyl), Ggpubr::stat_cor(aes(color = cyl), label.x = 3) Geom_smooth(aes(color = cyl), method = lm, # Extend the regression lines: fullrange = TRUEī + geom_point(aes(color = cyl, shape = cyl)) + Geom_smooth(aes(color = cyl, fill = cyl), method = "lm") + Change point colors and shapes by groups.ī + geom_point(aes(color = cyl, shape = cyl))+.The variable cyl is used as grouping variable. Set the default theme to theme_minimal() ĭataset: mtcars.Load required packages and set ggplot themes:.Install ggpmisc for adding the equation of a fitted regression line on a scatter plot:.Install the latest developmental version as follow:ĭevtools::install_github("wilkelab/cowplot") Will be used here to create a scatter plot with marginal density plots.
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