This is the learning set of the toy data, i.e. 1000 rows of the whole
1500 row dataset.
Columns "X1", "X2", …, "X10" were generated
with rnorm to follow a standard normal distribution.
Column "y" is a linear combination of "X1", "X2",
"X3", coefficients (1:3)/sqrt(sum((1:3)^2)), yielding a
theoretical standard normal distribution.
Column "noise" was also generated from the standard normal
distribution.
Use file.show(system.file("toyDataSrc", "sisalToy.R",
package="sisal")) to view the script that generated the data.