On this Picostat.com statistics page, you will find information about the hbk data set which pertains to Hawkins, Bradu, Kass's Artificial Data. The hbk data set is found in the robustbase R package. You can load the hbk data set in R by issuing the following command at the console data("hbk"). This will load the data into a variable called hbk. If R says the hbk 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 hbk R data set. The size of this file is about 1,202 bytes.
Hawkins, Bradu, Kass's Artificial Data
Artificial Data Set generated by Hawkins, Bradu, and Kass (1984). The
data set consists of 75 observations in four dimensions (one response
and three explanatory variables). It provides a good example of the
masking effect. The first 14 observations are outliers, created in
two groups: 1–10 and 11–14.
Only observations 12, 13 and 14 appear as outliers when using
classical methods, but can be easily unmasked using robust
distances computed by, e.g., MCD - covMcd().
A data frame with 75 observations on 4 variables, where the last
variable is the dependent one.
This data set is also available in package wle as
Hawkins, D.M., Bradu, D., and Kass, G.V. (1984)
Location of several outliers in multiple regression data using
Technometrics 26, 197–208.
P. J. Rousseeuw and A. M. Leroy (1987)
Robust Regression and Outlier Detection;
summary(lm.hbk <- lm(Y ~ ., data = hbk))hbk.x <- data.matrix(hbk[, 1:3])
(cHBK <- covMcd(hbk.x))
Dataset imported from https://www.r-project.org.