Hi all, I'm generating bivariate confidence ellipses using the car
library. I would also like to calculate the area of the ellipse, but
cannot figure out how. ||Specifically, I'm using the data.ellipse
function where I feed it my X and Y data and desired confidence level. I
cannot figure out within the function (or the function ellipse which is
called from data.ellipse) which variables represent the dimensions of
the major (a) and minor (b) axes, assuming they have already
incorporated correlation between X and Y. If I can get those, then the
area is easy (pi * a * b). It's probably easy, but it's got me stumped.
Any suggestions or alternative approaches would be greatly appreciated.
Thanks, bob
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