Nonparametric Estimation of the Moments of a General Statistic Computed from Spatial Data
Nonparametric Estimation of the Moments of a General Statistic Computed from Spatial Data
复制标题
根据空间数据计算的一般统计量的矩的非参数估计
DOI:
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发表时间:
1994
期刊:
影响因子:
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通讯作者:
E. Carlstein
中科院分区:
文献类型:
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作者:
M. Sherman;E. Carlstein
Abstract A statistic s(·) is computed on spatially indexed data {X i : i ∈ D}, where D is a finite subset of the integer lattice Z2. We propose a simple nonparametric method for estimating the moments (e.g., variance, skewness) of s(D), using only the observed data at hand. The method uses “replicates” of s(·) computed on smaller subsets of D. No explicit knowledge of the underlying spatial dependence mechanism is needed, and the marginal distribution of X i may also be unknown. The shape of D can be quite irregular, and s(·) is allowed to be a general statistic. The proposed estimator is shown to be consistent and asymptotically normal (under mild conditions on s(D) and “mixing” conditions on the strength of spatial dependence). As a numerical example, the estimator is used in assessing the geographic clumping of cancer deaths in the United States.