科研之友
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摘要
A general class of rank statistics based on the characteristic function is introduced for testing goodness-of-fit hypotheses about the copula of a continuous random vector. These statistics are defined as L-2 weighted functional distances between a nonparametric estimator and a semi-parametric estimator of the characteristic function associated with a copula. It is shown that these statistics behave asymptotically as degenerate V-statistics of order four and that the limit distributions have representations in terms of weighted sums of independent chi-square variables. The consistency of the tests against general alternatives is established and an asymptotically valid parametric bootstrap is suggested for the computation of the critical values of the tests. The behaviour of the new tests in small and moderate sample sizes is investigated with the help of simulations and compared with a competing test based on the empirical copula. Finally, the methodology is illustrated on a five-dimensional data set.
- 出版日期2018-6
