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O modelo logspline aplicado aos transectos lineares.

Authors: Rendas, L.M.P.; Alpizar-Jara, R.;

O modelo logspline aplicado aos transectos lineares.

Abstract

A teoria denominada logspline density estimation, permite estimar o logaritmo de uma função densidade de probabilidade utilizando-se splines cúbicos, estima ção por máxima verosimilhança, e adição e remoção de nós seleccionados pelas estatísticas de Rao e Wald, respectivamente. Faz-se uma adaptação desta teoria para estimar a probabilidade de detecção sobre a linha central de um transecto percorrido, e consequentemente, a densidade populacional de animais no contexto da amostragem por distâncias. Avalia-se a metodologia das logsplines aplicadas aos transectos lineares através de um conjunto alargado de simulações, e comparam-se os resultados com a metodologia mais utilizada actualmente, implementada no programa DISTANCE (http://www.ruwpa.st-and.ac.uk/distance). Os nossos resultados mostram que a estima ção por logsplines é uma alternativa competitiva com os métodos actualmente mais utilizados. Em particular, a técnica revelou ser superior quando se tem funções de detecção do tipo exponencial negativa. Analisa-se um exemplo prático com população conhecida para exempli car a aplicabilidade destas técnicas.

Country
Portugal
Related Organizations
Keywords

logsplines, transectos lineares

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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
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