R Dataset / Package robustbase / SiegelsEx


On this R-data statistics page, you will find information about the SiegelsEx data set which pertains to Siegel's Exact Fit Example Data. The SiegelsEx data set is found in the robustbase R package. You can load the SiegelsEx data set in R by issuing the following command at the console data("SiegelsEx"). This will load the data into a variable called SiegelsEx. If R says the SiegelsEx data set is not found, you can try installing the package by issuing this command install.packages("robustbase") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the SiegelsEx R data set. The size of this file is about 50 bytes.

Siegel's Exact Fit Example Data


A small counterexample data set devised by Andrew Siegel. Six (out of nine) data points lie on the line y = 0 such that some robust regression estimators exhibit the “exact fit” property.




A data frame with 9 observations on the following 2 variables.


a numeric vector


a numeric vector


Emerson and Hoaglin (1983, p.139)


Peter J. Rousseeuw and Annick M. Leroy (1987) Robust Regression and Outlier Detection Wiley, p.60–61


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)

Dataset imported from https://www.r-project.org.

Title Authored on Content type
OpenIntro Statistics Dataset - dream August 9, 2020 - 12:25 PM Dataset
OpenIntro Statistics Dataset - winery_cars August 9, 2020 - 2:38 PM Dataset
R Dataset / Package HSAUR / toothpaste March 9, 2018 - 1:06 PM Dataset
R Dataset / Package HSAUR / pottery March 9, 2018 - 1:06 PM Dataset
R Dataset / Package HistData / Guerry March 9, 2018 - 1:06 PM Dataset
<iframe src="https://r-data.pmagunia.com/iframe/r-dataset-package-robustbase-siegelsex.html" frameBorder="0" width="100%" height="307px" />
Attachment Size
dataset-17444.csv 50 bytes
Dataset License
GNU General Public License v2.0
Documentation License
GNU General Public License v2.0

This documentation is licensed under GPLv3 or later.