[R] calculating area of ellipse

[Stephen Ellison]

> 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


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