Papers › V-statistics and Variance Estimation
V-statistics and Variance Estimation
Zhengze Zhou, Lucas Mentch, Giles Hooker
This paper develops a general framework for analyzing asymptotics of V-statistics. Previous literature on limiting distribution mainly focuses on the cases when n →∞ with fixed kernel size k. Under some regularity conditions, we demonstrate asymptotic normality when k grows with n by utilizing existing results for U-statistics. The key in our approach lies in a mathematical reduction to U-statistics by designing an equivalent kernel for V-statistics. We also provide a unified treatment on variance estimation for both U- and V-statistics by observing connections to existing methods and proposing an empirically more accurate estimator. Ensemble methods such as random forests, where multiple base learners are trained and aggregated for prediction purposes, serve as a running example throughout the paper because they are a natural and flexible application of V-statistics.
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