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The Idle Column Method: Design Construction, Properties and Comparisons

Longcheen Huwang, C. F. J. Wu and C. H. Yen
Technometrics
Vol. 44, No. 4 (Nov., 2002), pp. 347-355
Stable URL: http://www.jstor.org/stable/1271542
Page Count: 9
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The Idle Column Method: Design Construction, Properties and Comparisons
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Abstract

Taguchi's idle column method for constructing arrays is investigated and generalized. A general construction method is proposed via a necessary and sufficient condition on two-level orthogonal arrays to which the method is applicable. A method is developed for identifying the idle column and pairs of columns in the arrays. Mixed two- and three-level idle column arrays with 64 or fewer runs are tabulated. Some guidelines are offered on when the idle column arrays should be used and when they should be replaced by orthogonal main-effect plans or D-optimal designs.

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