Journal
BIOMETRICAL JOURNAL
Volume 49, Issue 6, Pages 863-875Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/bimj.200610341
Keywords
BLUP; diagnostic; longitudinal data; repeated measures; residuals
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Residuals are frequently used to evaluate the validity of the assumptions of statistical models and may also be employed as tools for model selection. For standard (normal) linear models, for example, residuals are used to verify homoscedasticity, linearity of effects, presence of outliers, normality and independence of the errors. Similar uses may be envisaged for three types of residuals that emerge from the fitting of linear mixed models. We review some of the residual analysis techniques that have been used in this context and propose a standardization of the conditional residual useful to identify outlying observations and clusters. We illustrate the procedures with a practical example.
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