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Application of ‘delete = replace’ to deletion diagnostics for variance component estimation in the linear mixed model

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‘Delete¬†=¬†replace’ is a powerful and intuitive modelling identity. This paper extends previous work by stating and proving the identity in more general terms and extending its application to deletion diagnostics for estimates of variance components obtained by restricted maximum likelihood estimation for the linear mixed model. We present a new, fast, transparent and approximate computational procedure, arising as a by-product of the fitting process. We illustrate the effect of the deletion of individual observations, of ‘subjects’ and of arbitrary subsets. Central to the identity and its application is the conditional residual.
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Keywords: Conditional residuals; Generalized least squares; Leverage; Restricted maximum likelihood

Document Type: Research Article

Publication date: February 1, 2004

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