Dear Stephen
In that application the axes would be sensitivity and specificity (or
their inverses) or some transformation of them like logits so the units
would be the same. Whether the area has any scientific meaning I am not
sure.
Michael
On 11/05/2021 15:20, Stephen Ellison 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?
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
*******************************************************************
This email and any attachments are confidential. Any u...{{dropped:13}}
______________________________________________
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.
