Merge pull request #4803 from benyamindsmith/main

Included Friendly and Monette

Author: teunbrand

R/stat-ellipse.R

@@ -1,11 +1,14 @@
 #' Compute normal data ellipses
 #'
 #' The method for calculating the ellipses has been modified from
-#' `car::dataEllipse` (Fox and Weisberg, 2011)
+#' `car::dataEllipse` (Fox and Weisberg 2011, Friendly and Monette 2013)
 #'
 #' @references John Fox and Sanford Weisberg (2011). An \R Companion to
 #'   Applied Regression, Second Edition. Thousand Oaks CA: Sage. URL:
 #'   \url{https://socialsciences.mcmaster.ca/jfox/Books/Companion/}
+#' @refereces Michael Friendly. Georges Monette. John Fox. "Elliptical Insights: Understanding Statistical Methods through Elliptical Geometry." 
+#' Statist. Sci. 28 (1) 1 - 39, February 2013. URL: \url{https://projecteuclid.org/journals/statistical-science/volume-28/issue-1/Elliptical-Insights-Understanding-Statistical-Methods-through-Elliptical-Geometry/10.1214/12-STS402.full}
+#'
 #' @param level The level at which to draw an ellipse,
 #'   or, if `type="euclid"`, the radius of the circle to be drawn.
 #' @param type The type of ellipse.