Hi James, If the result contains the major (a) and minor (b) axes of the ellipse, it's easy:
area<-pi*a*b try using str() on the result you get. Jim On Fri, May 7, 2021 at 3:51 AM james meyer <meyer.ja...@usa.net> wrote: > > 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? > > thank you > James Meyer > > ______________________________________________ > 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. ______________________________________________ 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.
