Local influence in estimating equations |
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Authors: | Maria Kelly Venezuela,Mô nica Carneiro SandovalDenise Aparecida Botter |
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Affiliation: | a Insper Instituto de Ensino e Pesquisa, Rua Quatá, 300 - Vila Olímpia, São Paulo/SP, 04546-042, Brazilb Departamento de Estatística, IME, Universidade de São Paulo, Caixa Postal 66281, São Paulo/SP, 05311-970, Brazil |
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Abstract: | Local influence diagnostics based on estimating equations as the role of a gradient vector derived from any fit function are developed for repeated measures regression analysis. Our proposal generalizes tools used in other studies ( [Cook, 1986] and [Cadigan and Farrell, 2002]), considering herein local influence diagnostics for a statistical model where estimation involves an estimating equation in which all observations are not necessarily independent of each other. Moreover, the measures of local influence are illustrated with some simulated data sets to assess influential observations. Applications using real data are presented. |
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Keywords: | Diagnostic techniques Local influence Generalized estimating equations Repeated measures Longitudinal data |
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