Modelling count data based on weakly dependent spatial covariates using a copula approach: application to rat sightings
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http://dx.doi.org/10.1007/s10651-017-0379-x |
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Títol
Modelling count data based on weakly dependent spatial covariates using a copula approach: application to rat sightingsData de publicació
2017-09Editor
SpringerCita bibliogràfica
GRÄLER, Benedikt; AYYAD, Carlos; MATEU, Jorge. Modelling count data based on weakly dependent spatial covariates using a copula approach: application to rat sightings. Environmental and Ecological Statistics (2017), v. 24, issu 3, p. 433-448Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://link.springer.com/article/10.1007/s10651-017-0379-xVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
Not all environmental processes are observed in a way that allows a straight forward easy modelling. Nevertheless, insights can also be gained by exploring weakly dependent covariates paying attention to details of ... [+]
Not all environmental processes are observed in a way that allows a straight forward easy modelling. Nevertheless, insights can also be gained by exploring weakly dependent covariates paying attention to details of the distribution. Using the concept of copulas, it is possible to explore the dependence of a multivariate distribution without the distortion of the marginal distribution functions acting on typical correlation measures. Furthermore, copulas turn the attention to the dependence across the entire range of the multivariate distribution and do not only summarise it in a single correlation measure. In our application, we study counts of rat sightings in the city of Madrid. The brown rat lives with mankind and adversely affects public health by transmission of diseases, bites and allergies. Better understanding behavioural and spatial correlation aspects of this species can contribute to its effective management and control. We explore weakly to moderately correlated covariates based on distances to broken sewers, feeding grounds and markets as well as population density. The use of copulas is motivated by the different dependence structures of the four covariates and the asymmetries therein. In order to deal with the discrete zero-inflated counts, we present a new approach that assigns conditional random ranks to discrete data. This way, we mimic an underlying continuous variable easing the vine copula estimation, but do not destroy the dependence as in a uniform randomisation. We show that a 5-dimensional vine copula model is able to capture the dependence in our application. [-]
Publicat a
Environmental and Ecological Statistics (2017), v. 24, Issue 3Proyecto de investigación
1) Grants P1-1B2012-52 and MTM2013-43917-P; 2) German Research Foundation (DFG PE 1632/4-1)Drets d'accés
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info:eu-repo/semantics/restrictedAccess
info:eu-repo/semantics/restrictedAccess
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