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The Factor Analytic Approach to Simultaneous Inference in the General Linear Model

Jason C. Hsu
Journal of Computational and Graphical Statistics
Vol. 1, No. 2 (Jun., 1992), pp. 151-168
DOI: 10.2307/1390839
Stable URL: http://www.jstor.org/stable/1390839
Page Count: 18
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The Factor Analytic Approach to Simultaneous Inference in the General Linear Model
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Abstract

Consider the general linear model (GLM) Y = Xβ + ε. Suppose θ 1,...,θ k, a subset of the β's, are of interest; θ 1,...,θ k may be treatment contrasts in an ANOVA setting or regression coefficients in a response surface setting. Existing simultaneous confidence intervals for θ 1,...,θ k are relatively conservative or, in the case of the MEANS option in PROC GLM of SAS, possibly misleading. The difficulty is with the multidimensionality of the integration required to compute exact coverage probability when X does not follow a nice textbook design. Noting that such exact coverage probabilities can be computed if the correlation matrix R of the estimators of θ 1,...,θ k has a one-factor structure in the factor analytic sense, it is proposed that approximate simultaneous confidence intervals be computed by approximating R with the closest one-factor structure correlation matrix. Computer simulations of hundreds of randomly generated designs in the settings of regression, analysis of covariance, and unbalanced block designs show that the coverage probabilities are practically exact, more so than can be anticipated by even second-order probability bounds.

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