Efficient Estimation for Random Dot Product Graphs via a One-Step Procedure
Efficient Estimation for Random Dot Product Graphs via a One-Step Procedure
复制标题
通过一步程序有效估计随机点积图
DOI:
10.1080/01621459.2021.1948419
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发表时间:
2021
影响因子:
3.7
通讯作者:
Xu, Yanxun
中科院分区:
文献类型:
--
作者:
Xie, Fangzheng;Xu, Yanxun
We propose a one-step procedure to estimate the latent positions in random dot product graphs efficiently. Unlike the classical spectral-based methods, the proposed one-step procedure takes advantage of both the low-rank structure of the expected adjacency matrix and the Bernoulli likelihood information of the sampling model simultaneously. We show that for each vertex, the corresponding row of the one-step estimator (OSE) converges to a multivariate normal distribution after proper scaling and centering up to an orthogonal transformation, with an efficient covariance matrix. The initial estimator for the one-step procedure needs to satisfy the so-called approximate linearization property. The OSE improves the commonly adopted spectral embedding methods in the following sense: Globally for all vertices, it yields an asymptotic sum of squares error no greater than those of the spectral methods, and locally for each vertex, the asymptotic covariance matrix of the corresponding row of the OSE dominates those of the spectral embeddings in spectra. The usefulness of the proposed one-step procedure is demonstrated via numerical examples and the analysis of a real-world Wikipedia graph dataset.
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DOI:
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发表时间:
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期刊:
Social Science Research Network
影响因子:
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DOI:
10.1111/rssb.12509
发表时间:
2017-09
期刊:
Journal of the Royal Statistical Society: Series B (Statistical Methodology)
影响因子:
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DOI:
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发表时间:
2020
期刊:
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作者:
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