This paper provides general matrix formulas for computing the score function, the (expected and observed) Fisher information and the matrices (required for the assessment of local influence) for a quite general model which includes the one proposed by Russo etÂ al. (2009). Additionally, we also present an expression for the generalized leverage on fixed and random effects. The matrix formulation has notational advantages, since despite the complexity of the postulated model, all general formulas are compact, clear and have nice forms.Elliptical models Influence diagnostics Matrix operations Nonlinear models
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