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Fitting one matrix to another under choice of a central dilation and a rigid motion
A least squares method is presented for fitting a given matrixA to another given matrixB under choice of an unknown rotation, an unknown translation, and an unknown central dilation. The procedureExpand
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Alpha Coefficients for Stratified-Parallel Tests
IN an internal-consistency study investigators almost always rely on the KR20 formula or its generalized version «, a coefficient most appropriate for tests formed by random sampling of itemsExpand
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On models and muddles of heritability
One reason for the astonishing persistence of the IQ myth in the face of overwhelming prior and posterior odds against it may be the unbroken chain of excessive heritability claims forExpand
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The minimum average correlation between equivalent sets of uncorrelated factors
A simplified proof of a lemma by Ledermann [1938], which lies at the core of the factor indeterminacy issue, is presented. It leads to a representation of an orthogonal matrixT, relating equivalentExpand
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A maximum likelihood solution for the method of successive intervals allowing for unequal stimulus dispersions
A maximum likelihood solution for the method of successive intervals is presented together with an iterative procedure for obtaining estimates for stimulus scale values, boundary scale values, andExpand
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Saliency metric for subadditive dissimilarity judgments of rectangles
Previous findings that dissimilarity judgments for rectangles are strongly subadditive, that qualitative individual differences are always present, and that four-parameter psychophysical maps canExpand
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A solution to the weighted procrustes problem in which the transformation is in agreement with the loss function
This paper provides a generalization of the Procrustes problem in which the errors are weighted from the right, or the left, or both. The solution is achieved by having the orthogonality constraintExpand
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Psychometrics of Intelligence
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Some new results on factor indeterminacy
Some relations between maximum likelihood factor analysis and factor indeterminacy are discussed. Bounds are derived for the minimum average correlation between equivalent sets of correlated factorsExpand
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