Wolf and Bassler [10] have presented a general linear model approach to the estimation of a variance‐accounted‐for measure of effect magnitude. This commentary questions the usefulness of such a measure, citing its inconsistency with contrast estimates, problems with its interpretation in nonorthogonal designs, and its susceptibility to extraneous influence unrelated to observed differences among group means. In addition, it questions whether the term “importance” should be applied to such a measure.
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Stephen A. LaTour (1981) studied this question.
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