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Nonparametric estimation of copula functions for dependence modelling. (English) Zbl 1129.62023

Summary: Copulas characterize the dependence among components of random vectors. Unlike marginal and joint distributions, which are directly observable, the copula of a random vector is a hidden dependence structure that links the joint distribution with its margins. Choosing a parametric copula model is thus a nontrivial task but it can be facilitated by relying on a nonparametric estimator.
The authors propose a kernel estimator of the copula that is mean square consistent everywhere on the support. They determine the bias and variance of this estimator. They also study the effects of kernel smoothing on copula estimation. They then propose a smoothing bandwidth selection rule based on the derived bias and variance. After confirming their theoretical findings through simulations, they use their kernel estimator to formulate a goodness-of-fit test for parametric copula models.

MSC:

62G07 Density estimation
62H05 Characterization and structure theory for multivariate probability distributions; copulas
62G05 Nonparametric estimation
62E20 Asymptotic distribution theory in statistics
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References:

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