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A note on Influence diagnostics in nonlinear mixed-effects elliptical models

Alexandre G. Patriota
Arxiv ID: 0906.0113Last updated: 9/17/2021
This paper provides general matrix formulas for computing the score function, the (expected and observed) Fisher information and the $\Delta$ matrices (required for the assessment of local influence) for a quite general model which includes the one proposed by Russo et al. (2009). Additionally, we also present an expression for the generalized leverage. The matrix formulation has a considerable advantage, since although the complexity of the postulated model, all general formulas are compact, clear and have nice forms.

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