On a heuristic analysis of highly fractionated 2
n
factorial experiments |
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Authors: | C Auer J Kunert |
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Institution: | 1. Fachbereich Statistik, Universit?t Dortmund, D 44221, Dortmund, Germany
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Abstract: | The paper deals with a method for the analysis of highly fractionated factorial designs proposed by Raghavarao and Altan in
Metrika 58:185–191 (2003). We show that the method will find “active” factors with almost any set of random numbers. Once
that an alias set is found active, Raghavarao and Altan claim that their method can resolve the alias structure of the design
and identify which of several confounded effects is active. We show that their method cannot do that. The error in Raghavarao
and Altan’s arguments lies in the fact that they treat a set of highly dependent (sometimes even identical) F-statistics as
if they were independent. |
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Keywords: | Fractional factorial designs Half-normal plot Heuristic arguments Active effects Alias set |
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