Estimating the Extremal Index
Estimating the Extremal Index
复制标题
估计极值指数
DOI:
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发表时间:
1994
期刊:
影响因子:
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通讯作者:
I. Weissman
中科院分区:
文献类型:
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作者:
Richard L. Smith;I. Weissman
SUMMARY The extremal index is an important parameter measuring the degree of clustering of process. The extremal index, a parameter in the interval [0, 1], is the reciprocal of the mean cluster size. Apart from being of interest in its own right, it is a crucial parameter for determining the limiting distribution of extreme values from the process. In this paper we review current work on statistical estimation of the extremal index and consider an optimality criterion based on a bias-variance trade-off. Theoretical results are developed for a simple doubly stochastic process, and it is argued that the main formula obtained is valid for a much wider class of processes. The practical implications are examined through simulations and a real data example.