Abstract

MORALES, MARIO  and  LOZANO, JOSE. Prueba de homogeneidad de la dispersión para datos de proporción sobredispersos mediante regresión beta. Integración - UIS [online]. 2014, vol.32, n.1, pp.55-70. ISSN 0120-419X.

In this paper we propose an approach to validate the hypothesis of homogeneity of the dispersion parameter using beta regression, when we have overdispersed proportions data. We corroborated that it is possible to analyze this type of data with an usual weighted generalized linear model, weighting the observations with weights obtained through beta regression. This procedure allows to correct the problem of overdispersion keeping the simplicity of the analysis. Furthermore, for several cases, we made a simulation study of the power of the test.

Keywords : Overdispersion; proportion data; beta regression; likelihood ratio; generalized linear models.

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