standard.ellipse: Standard Ellipse
In AndrewLJackson/siar: Stable Isotope Analysis in R

Fits a standard ellipse to bivariate data analytically using maximum likelihood estimators.

1	standard.ellipse(x,y,confs=NULL,steps=5)

`x`	Vector of x data.
`y`	Vector of y data.
`confs`	Optional list of confidence intervals as a vector. If specified will calculate the confidence intervals of the means and store their coordinates in a list (useful for plotting). Defaults to Null.
`steps`	A visual rendering option that sets the number of step-size and hence resolution of the points used to draw the lines defining the ellipses. The larger the value, the more angular the ellipses will appear.

`CEA`	The area of the 95 percent confidence ellipse.
`SEA`	The area of the standard ellipse.
`SEAc`	The area of the small sample size corrected standard ellipse.
`theta`	The angle of the semi-major axis of the ellipse with the x-axis.
`confs`	list of the confidence intervals of the mean, if speficied.
`xCEA`	x coordinates of the confidence ellipses.
`yCEA`	y coordinates of the confidence ellipses.
`xSEA`	x coordinates of the standard ellipse.
`ySEA`	y coordinates of the standard ellipse.
`xSEAc`	x coordinates of the small sample size corrected standard ellipse.
`ySEAc`	y coordinates of the small sample size corrected standard ellipse.
`eccentricity`	Eccentricity of the ellipse
`a`	The length of the semi-major axis a
`b`	The length of the semi-minor axis a
`r`	The correlation coefficient of the data
`ac`	The length of the semi-major axis a based on the small sample size correction.
`bc`	The length of the semi-minor axis b based on the small sample size correction.