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Residuals for the linear model with general covariance structure

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A general theory is presented for residuals from the general linear model with correlated errors. It is demonstrated that there are two fundamental types of residual associated with this model, referred to here as the marginal and the conditional residual. These measure respectively the distance to the global aspects of the model as represented by the expected value and the local aspects as represented by the conditional expected value. These residuals may be multivariate. Some important dualities are developed which have simple implications for diagnostics. The results are illustrated by reference to model diagnostics in time series and in classical multivariate analysis with independent cases.
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Keywords: Cross-validation; Diagnostics; Generalized least squares; Geostatistics; Kriging; Mahalanobis distance; Residuals; Time series

Document Type: Original Article

Affiliations: 1: Trinity College Dublin, Republic of Ireland, 2: University of Limerick, Republic of Ireland

Publication date: 1998-01-01

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