| ellipse {ellipse} | R Documentation |
This function returns an ellipse or other outline of a confidence region
for two parameters.
This is a generic function.
Functions with names beginning in ellipse. will be
methods for this function.
lm, nls, profile, profile.nls
ellipse(x, ...)
x |
An S object. |
... |
Each of the specialized types uses different optional parameters. |
A matrix is returned with two columns outlining an ellipse or a confidence region.
ellipse.arima, plotcorr
# Plot an ellipse corresponding to a 95% probability region for a
# bivariate normal distribution with mean 0, unit variances and
# correlation 0.8.
plot(ellipse(0.8),type='l')
# Plot the joint 95% confidence region for the weight and displacement
# parameters in the Fuel dataset
data(fuel.frame)
fit <- lm(Fuel ~ . , fuel.frame)
plot(ellipse(fit,which=c('Weight','Disp.')),type='l')