SiegelsEx {robustbase} | R Documentation |
Siegel's Exact Fit Example Data
Description
A small counterexample data set devised by Andrew Siegel.
Six (out of nine) data points lie on the line such that
some robust regression estimators exhibit the “exact fit”
property.
Usage
data(SiegelsEx, package="robustbase")
Format
A data frame with 9 observations on the following 2 variables.
x
a numeric vector
y
a numeric vector
Source
Emerson and Hoaglin (1983, p.139)
References
Peter J. Rousseeuw and Annick M. Leroy (1987) Robust Regression and Outlier Detection Wiley, p.60–61
Examples
data(SiegelsEx)
plot(SiegelsEx, main = "Siegel's example for 'exact fit'")
abline( lm(y ~ x, data = SiegelsEx))
abline(MASS::lqs(y ~ x, data = SiegelsEx, method = "lms"), col = 2)
legend("topright", leg = c("lm", "LMS"), col=1:2, lwd=1, inset = 1/20)
[Package robustbase version 0.99-3 Index]