Two-Sample Testing for Tail Copulas with an Application to Equity Indices
尾部 Copula 的双样本检验及股票指数应用AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要研究股票指数负收益的尾部依赖及其变化,直接对应金融尾部风险。
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A novel, general two-sample hypothesis testing procedure is established for testing the equality of tail copulas associated with bivariate data.More precisely, using a martingale transformation of a natural twosample tail copula process, a test process is constructed, which is shown to converge in distribution to a standard Wiener process.Hence, from this test process a myriad of asymptotically distribution-free twosample tests can be obtained.The good finite-sample behavior of our procedure is demonstrated through Monte Carlo simulations.Using the new testing procedure, no evidence of a difference in the respective tail copulas is found for pairs of negative daily log-returns of equity indices during and after the global financial crisis.