Nonparametric Estimation in the Dynamic Bradley-Terry Model
Nonparametric Estimation in the Dynamic Bradley-Terry Model
复制标题
动态 Bradley-Terry 模型中的非参数估计
DOI:
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发表时间:
2020
期刊:
影响因子:
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通讯作者:
A. Rinaldo
中科院分区:
文献类型:
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作者:
Heejong Bong;Wanshan Li;Shamindra Shrotriya;A. Rinaldo
We propose a time-varying generalization of the Bradley-Terry model that allows for nonparametric modeling of dynamic global rankings of distinct teams. We develop a novel estimator that relies on kernel smoothing to pre-process the pairwise comparisons over time and is applicable in sparse settings where the Bradley-Terry may not be fit. We obtain necessary and sufficient conditions for the existence and uniqueness of our estimator. We also derive time-varying oracle bounds for both the estimation error and the excess risk in the model-agnostic setting where the Bradley-Terry model is not necessarily the true data generating process. We thoroughly test the practical effectiveness of our model using both simulated and real world data and suggest an efficient data-driven approach for bandwidth tuning.