[R] calculating area of ellipse

[Jim Lemon]

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.james using 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
>
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