DISTANCE COVARIANCE IN METRIC SPACES
DISTANCE COVARIANCE IN METRIC SPACES
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DOI:
10.1214/12-aop803
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发表时间:
2013-09-01
影响因子:
2.3
通讯作者:
Lyons, Russell
中科院分区:
文献类型:
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作者:
Lyons, Russell
We extend the theory of distance (Brownian) covariance from Euclidean spaces, where it was introduced by Szekely, Rizzo and Bakirov, to general metric spaces. We show that for testing independence, it is necessary and sufficient that the metric space be of strong negative type. In particular, we show that this holds for separable Hilbert spaces, which answers a question of Kosorok. Instead of the manipulations of Fourier transforms used in the original work, we use elementary inequalities for metric spaces and embeddings in Hilbert spaces.