Abstract

Slope rotatability over all directions (SROAD) is a useful concept when the slope of a second-order response is to be studied. SROAD designs ensure that knowledge jof the slope is acquired symmetrically, whatever direction later becomes of more interest as the data are analyzed. In a prior paper, we explored designs for k=2 and 3 dimensions, which do not have the full symmetries of second-order designs but which still possess the SROAD property.Here, we discuss designs in higher dimensions.The introductory sections 1 and 2 are essentially identical to those of the prior paper.

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