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Exact tests in two-way unbalanced mixed models

Viviana Beatriz Lencina Júlio da Motta Singer 1950-; Simpósio Nacional de Probabilidade e Estatística (15. 2002 São Paulo)

Resumos São Paulo : ABE, 2002

São Paulo ABE 2002

Localização: IME - Inst. Matemática e Estatística    (PROD-1272248 ) e outros locais(Acessar)

  • Título:
    Exact tests in two-way unbalanced mixed models
  • Autor: Viviana Beatriz Lencina
  • Júlio da Motta Singer 1950-; Simpósio Nacional de Probabilidade e Estatística (15. 2002 São Paulo)
  • Assuntos: COMPONENTES DE VARIÂNCIA
  • É parte de: Resumos São Paulo : ABE, 2002
  • Descrição: We consider exact F tests for null variance components under two common mixed models employed for the analysis of two facto r problems with unbalanced data. We show that, under the so-called unconstrained parameter (UP) model, the test statistics are obtained by direct application of the transformations proposed by Õfversten (Biometrics, 1993). We consider additional transformations to obtain the corresponding test statistics under the constrained parameter (CP) model and show that they coincide with the usual F statistics constructed from ANOVA type 111mean squares. We study the power of such tests under different unbalance patterns and show that although the loss of power increases with the degree of unbalancedness, it still remains reasonable trem a practical point of view.
  • Editor: São Paulo ABE
  • Data de criação/publicação: 2002
  • Formato: p. 58.
  • Idioma: Inglês

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