The
longley.x
and
longley.y
data sets contain regression data from a study by J.W. Longley. The regression is known to be highly collinear.
Longley, J.W. (1967). An appraisal of least-squares programs from the point of view of the user. Journal of the American Statistical Association 62: 819-841. Republished by permission of the American Statistical Association.