Abstract
AbstractDas (Calcutta Statist. Assoc. Bull. 2003; 54:57–70) initiated a study of slope rotatability over axial directions with correlated errors. General conditions for second‐order slope rotatability over axial directions were derived when errors have a general correlated error structure.In this paper, a class of multifactor designs for estimating the slope of second‐order response surfaces is considered when errors in observations are correlated. General conditions for second‐order slope rotatability over all directions have been derived assuming that errors in observations have a general correlated error structure. It has been derived that robust second‐order rotatable designs are also robust slope rotatable over all directions. The class of robust slope‐rotatable designs over all directions has been examined when errors in observations have the following variance–covariance structures: intra‐class, inter‐class, compound symmetry, tri‐diagonal and autocorrelated structure. Copyright © 2006 John Wiley & Sons, Ltd.
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