Invariance of generalized wordlength patterns

Details Invariance of generalized wordlength patterns Invariance of generalized wordlength patterns

2009-01-03

arxiv.org/abs/0901.0335v1

Statistics

Methodology

To appear in: Journal of Statistical Planning and Inference

Scientific paper

The generalized wordlength pattern (GWLP) introduced by Xu and Wu (2001) for an arbitrary fractional factorial design allows one to extend the use of the minimum aberration criterion to such designs. Ai and Zhang (2004) defined the $J$-characteristics of a design and showed that they uniquely determine the design. While both the GWLP and the $J$-characteristics require indexing the levels of each factor by a cyclic group, we see that the definitions carry over with appropriate changes if instead one uses an arbitrary abelian group. This means that the original definitions rest on an arbitrary choice of group structure. We show that the GWLP of a design is independent of this choice, but that the $J$-characteristics are not. We briefly discuss some implications of these results.

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