On 5/6/21 6:29 PM, Jim Lemon wrote:
Hi James,
If the result contains the major (a) and minor (b) axes of the
ellipse, it's easy:
area<-pi*a*b
ITYM semi-major and semi-minor axes.
--
David
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
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