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The panelist by treatment interaction variation is used to investigate panel inconsistency. The approach tests for panelist outliers with different univariate response patterns to a set of treatments to determine the relative effect(s) of interaction variation sources on the detection of treatment differences. Algorithms and examples are followed by a discussion of the theoretical and practical significance of panel inconsistency and the removal of panelist outliers.
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Lundahl et al. (1990) studied this question.
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