Nonparametric Estimation of the Moments of a General Statistic Computed from Spatial Data
空间数据一般统计量矩的非参数估计AI 解读 ↓
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空间数据一般统计量矩的非参数估计AI 解读 ↓
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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.