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作者：Francom, Devin; Sanso, Bruno; Bulaevskaya, Vera; Lucas, Donald; Simpson, Matthew
作者单位：United States Department of Energy (DOE); Los Alamos National Laboratory; University of California System; University of California Santa Cruz; United States Department of Energy (DOE); Lawrence Livermore National Laboratory
摘要：An atmospheric release of hazardous material, whether accidental or intentional, can be catastrophic for those in the path of the plume. Predicting the path of a plume based on characteristics of the release (location, amount, and duration) and meteorological conditions is an active research area highly relevant for emergency and long-term response to these releases. As a result, researchers have developed particle dispersion simulators to provide plume path predictions that incorporate releas...
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作者：Yan, Ting; Jiang, Binyan; Fienberg, Stephen E.; Leng, Chenlei
作者单位：Central China Normal University; Hong Kong Polytechnic University; Carnegie Mellon University; University of Warwick; Alan Turing Institute
摘要：Networks are often characterized by node heterogeneity for which nodes exhibit different degrees of interaction and link homophily for which nodes sharing common features tend to associate with each other. In this article, we rigorously study a directed network model that captures the former via node-specific parameterization and the latter by incorporating covariates. In particular, this model quantifies the extent of heterogeneity in terms of outgoingness and incomingness of each node by dif...
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作者：Zhu, Rong; Wan, Alan T. K.; Zhang, Xinyu; Zou, Guohua
作者单位：Chinese Academy of Sciences; Academy of Mathematics & System Sciences, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; City University of Hong Kong; Capital Normal University
摘要：In the last decade, significant theoretical advances have been made in the area of frequentist model averaging (FMA); however, the majority of this work has emphasized parametric model setups. This article considers FMA for the semiparametric varying-coefficient partially linear model (VCPLM), which has gained prominence to become an extensively used modeling tool in recent years. Within this context, we develop a Mallows-type criterion for assigning model weights and prove its asymptotic opti...
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作者：Bellach, Anna; Kosorok, Michael R.; Rueschendorf, Ludger; Fine, Jason P.
作者单位：University of Copenhagen; University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina; University of North Carolina Chapel Hill
摘要：Direct regression modeling of the subdistribution has become popular for analyzing data with multiple, competing event types. All general approaches so far are based on nonlikelihood-based procedures and target covariate effects on the subdistribution. We introduce a novel weighted likelihood function that allows for a direct extension of the Fine-Gray model to a broad class of semiparametric regression models. The model accommodates time-dependent covariate effects on the subdistribution haza...
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作者：D'Amour, Alexander
作者单位：Alphabet Inc.; Google Incorporated
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作者：Dryden, Ian L.; Preston, Simon P.; Severn, Katie E.
作者单位：University of Nottingham
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作者：Chen, Likai; Wu, Wei Biao
作者单位：University of Chicago
摘要：The article considers statistical inference for trends of high-dimensional time series. Based on a modified distance between parametric and nonparametric trend estimators, we propose a de-diagonalized quadratic form test statistic for testing patterns on trends, such as linear, quadratic, or parallel forms. We develop an asymptotic theory for the test statistic. A Gaussian multiplier testing procedure is proposed and it has an improved finite sample performance. Our testing procedure is applie...
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作者：Landau, Will; Niemi, Jarad; Nettleton, Dan
作者单位：Iowa State University
摘要：Heterosis, or hybrid vigor, is the enhancement of the phenotype of hybrid progeny relative to their inbred parents. Heterosis is extensively used in agriculture, and the underlying mechanisms are unclear. To investigate the molecular basis of phenotypic heterosis, researchers search tens of thousands of genes for heterosis with respect to expression in the transcriptome. Difficulty arises in the assessment of heterosis due to composite null hypotheses and nonuniform distributions for p-values ...
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作者：Mao, Xiaojun; Chen, Song Xi; Wong, Raymond K. W.
作者单位：Iowa State University; Peking University; Peking University; Texas A&M University System; Texas A&M University College Station
摘要：This article investigates the problem of matrix completion from the corrupted data, when the additional covariates are available. Despite being seldomly considered in the matrix completion literature, these covariates often provide valuable information for completing the unobserved entries of the high-dimensional target matrix A(0). Given a covariate matrix X with its rows representing the row covariates of A(0), we consider a column-space-decomposition model A(0) = X-0 + B-0, where (0) is a c...
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作者：Qian, Wei; Ding, Shanshan; Cook, R. Dennis
作者单位：University of Delaware; University of Minnesota System; University of Minnesota Twin Cities
摘要：Sufficient dimension reduction (SDR) is known to be a powerful tool for achieving data reduction and data visualization in regression and classification problems. In this work, we study ultrahigh-dimensional SDR problems and propose solutions under a unified minimum discrepancy approach with regularization. When p grows exponentially with n, consistency results in both central subspace estimation and variable selection are established simultaneously for important SDR methods, including sliced ...
