The method for calculating the ellipses has been modified from
car::ellipse
(Fox and Weisberg, 2011)
stat_ellipse(mapping = NULL, data = NULL, geom = "path", position = "identity", ..., type = "t", level = 0.95, segments = 51, na.rm = FALSE, show.legend = NA, inherit.aes = TRUE)
mapping | Set of aesthetic mappings created by |
---|---|
data | The data to be displayed in this layer. There are three options: If A A |
geom | The geometric object to use display the data |
position | Position adjustment, either as a string, or the result of a call to a position adjustment function. |
... | Other arguments passed on to |
type | The type of ellipse.
The default |
level | The confidence level at which to draw an ellipse (default is 0.95),
or, if |
segments | The number of segments to be used in drawing the ellipse. |
na.rm | If |
show.legend | logical. Should this layer be included in the legends?
|
inherit.aes | If |
John Fox and Sanford Weisberg (2011). An R Companion to Applied Regression, Second Edition. Thousand Oaks CA: Sage. URL: http://socserv.socsci.mcmaster.ca/jfox/Books/Companion
ggplot(faithful, aes(waiting, eruptions, color = eruptions > 3)) + geom_point() + stat_ellipse(type = "norm", linetype = 2) + stat_ellipse(type = "t")ggplot(faithful, aes(waiting, eruptions, color = eruptions > 3)) + geom_point() + stat_ellipse(type = "norm", linetype = 2) + stat_ellipse(type = "euclid", level = 3) + coord_fixed()