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Selecção de modelos em amostragem por distâncias

Authors: Morgado, F.; Alpizar-Jara, R.; Saias, J.;

Selecção de modelos em amostragem por distâncias

Abstract

A selecção de um modelo que se ajuste adequadamente a um conjunto de dados é uma parte fulcral no processo da inferência estatística. O critério mais comum para seleccionar uma função de detectabilidade, que se ajuste a um conjunto de dados de distâncias, denomina-se critério de informação de Akaike (AIC). Para avaliar a performance da rotina da selecção de modelos implementada no programa DISTANCE (Thomas et al., 2006) realizaram-se simulações Monte Carlo para gerar dados de duas funções densidade de probabilidade frequentemente usadas. Aplicando esta metodologia, observou-se um enviesamento substancial na selecção do modelo, sendo os estimadores dos parâmetros baseados no modelo seleccionado frequentemente enviesados. Utilizaram-se duas abordagens na estimação dos parâmetros: selecção de modelos tradicional (ST) e ponderação de modelos (PM). Para ilustrar a metodologia da selecção de modelos usaram-se dados provenientes de um estudo controlado.

Country
Portugal
Related Organizations
Keywords

Seleção de modelos, AIC, Amostragem por distâncias

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green