Time series copulas for heteroskedastic data
异方差数据的时间序列Copula模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接讨论异方差时间序列的序列依赖和波动共动、溢出,并提供汇率收益与VaR预测应用,对应时间序列、波动率和尾部风险。
异方差数据的时间序列Copula模型AI 解读 ↓
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Summary We propose parametric copulas that capture serial dependence in stationary heteroskedastic time series. We suggest copulas for first‐order Markov series, and then extend them to higher orders and multivariate series. We derive the copula of a volatility proxy, based on which we propose new measures of volatility dependence, including co‐movement and spillover in multivariate series. In general, these depend upon the marginal distributions of the series. Using exchange rate returns, we show that the resulting copula models can capture their marginal distributions more accurately than univariate and multivariate generalized autoregressive conditional heteroskedasticity models, and produce more accurate value‐at‐risk forecasts.
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尾部与非尾部记忆:极值及稳健统计的应用
New notions of tail and nontail dependence are used to characterize separately extremal and nonextremal information, including tail log-exceedances and events, and tail-trimmed levels. We prove that near epoch dependence (McLeish, 1975; Gallant and White, 1988) and L 0 -approximability (Pötscher and Prucha, 1991) are equivalent for tail events and tail-trimmed levels, ensuring a Gaussian central limit theory for important extreme value and robust statistics under general…