longley2
(Package: RXshrink) :
Art Hoerl's update of the infamous Longley(1967) benchmark dataset
Data from the "Employment and Training Report of the President, 1976" compiled by Art Hoerl, University of Delaware. Some slightly different numerical values than those used by Longley(1967) ...plus the added years of 1963-1975. Longley(1967) used only data from the 16 years of 1947 through 1962.
haldport
(Package: RXshrink) :
Portland Cement benchmark of Hald(1952)
Heat evolved during setting of 13 cement mixtures of four basic ingredients. Each ingredient percentage appears to be rounded down to a full integer. The sum of the four mixture percentages varies from a maximum of 99% to a minimum of 95%. If all four regressor X-variables always summed to 100%, the centered X-matrix would then be of rank only 3. Thus, the regression of heat on four X-percentages is ill-conditioned, with an approximate rank deficiency of MCAL = 1.
providing 
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