> In doing meta-analysis of diagnostic accuracy I produce ellipses of confidence > and prediction intervals in two dimensions. How can I calculate the area of > the ellipse in ggplot2 or base R?
There are established formulae for ellipse area, but I am curious: in a 2-d ellipse with different quantities (eg coefficients for salary and age) represented by the different dimensions, what does 'area' mean? S ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.