On Slope Rotatability of Central Composite Designs of the Second Type Kim, Hyuk-Joo; Ko, Yun-Mi;
Kim(2002) proposed a second type of central composite design (CCD2), in which the positions of the axial points are indicated by two numbers. In this paper, we study properties of CCD2 when we are interested in estimating the slope of a response surface. Conditions are obtained for CCD2 to be slope-rotatable over axial directions, and some CCD2's are presented that have slope rotatability over axial directions. Also values of a measure of slope rotatability over axial directions are tabulated for various CCD2's. Finally, it is shown that CCD2 is always slope-rotatable over all directions.
Central composite design of the second type;Slope rotatability over axial directions;Slope rotatability over all directions;
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