537期

最新文章

• Estimation of Subgraph Densities in Noisy Networks AI翻译
  作者：Chang, Jinyuan; Kolaczyk, Eric D.; Yao, Qiwei
  作者单位：Southwestern University of Finance & Economics - China; Boston University; University of London; London School Economics & Political Science
  摘要：While it is common practice in applied network analysis to report various standard network summary statistics, these numbers are rarely accompanied by uncertainty quantification. Yet any error inherent in the measurements underlying the construction of the network, or in the network construction procedure itself, necessarily must propagate to any summary statistics reported. Here we study the problem of estimating the density of an arbitrary subgraph, given a noisy version of some underlying n...
• Comment on Factor Models for High-Dimensional Tensor Time Series AI翻译
  作者：Pena, Daniel
  作者单位：Universidad Carlos III de Madrid; Universidad Carlos III de Madrid
• Earthquake Risk Embedded in Property Prices: Evidence From Five Japanese Cities AI翻译
  作者：Ikefuji, Masako; Laeven, Roger J. A.; Magnus, Jan R.; Yue, Yuan
  作者单位：University of Tsukuba; University of Osaka; University of Amsterdam; Tilburg University; Eindhoven University of Technology; Vrije Universiteit Amsterdam; Tinbergen Institute
  摘要：We analyze the impact of short-run (90 days) and long-run (30 years) earthquake risk on real estate transaction prices in five Japanese cities (Tokyo, Osaka, Nagoya, Fukuoka, and Sapporo), using quarterly data over the period 2006-2015. We exploit a rich panel dataset (331,343 observations) with property characteristics, ward attractiveness information, macroeconomic variables, and long-run seismic hazard data, supplemented with short-run earthquake probabilities generated from a seismic excit...
• Large-Scale Hypothesis Testing for Causal Mediation Effects with Applications in Genome-wide Epigenetic Studies AI翻译
  作者：Liu, Zhonghua; Shen, Jincheng; Barfield, Richard; Schwartz, Joel; Baccarelli, Andrea A.; Lin, Xihong
  作者单位：University of Hong Kong; Utah System of Higher Education; University of Utah; Duke University; Harvard University; Harvard T.H. Chan School of Public Health; Columbia University; Harvard University; Harvard T.H. Chan School of Public Health; Harvard University
  摘要：In genome-wide epigenetic studies, it is of great scientific interest to assess whether the effect of an exposure on a clinical outcome is mediated through DNA methylations. However, statistical inference for causal mediation effects is challenged by the fact that one needs to test a large number of composite null hypotheses across the whole epigenome. Two popular tests, the Wald-type Sobel's test and the joint significant test using the traditional null distribution are underpowered and thus ...
• Factor Models for High-Dimensional Tensor Time Series AI翻译
  作者：Chen, Rong; Yang, Dan; Zhang, Cun-Hui
  作者单位：Rutgers University System; Rutgers University New Brunswick; University of Hong Kong
  摘要：Large tensor (multi-dimensional array) data routinely appear nowadays in a wide range of applications, due to modern data collection capabilities. Often such observations are taken over time, forming tensor time series. In this article we present a factor model approach to the analysis of high-dimensional dynamic tensor time series and multi-category dynamic transport networks. This article presents two estimation procedures along with their theoretical properties and simulation results. We pr...
• Testing for Balance in Social Networks AI翻译
  作者：Feng, Derek; Altmeyer, Randolf; Stafford, Derek; Christakis, Nicholas A.; Zhou, Harrison H.
  作者单位：Yale University; University of Cambridge; Yale University
  摘要：Friendship and antipathy exist in concert with one another in real social networks. Despite the role they play in social interactions, antagonistic ties are poorly understood and infrequently measured. One important theory of negative ties that has received relatively little empirical evaluation is balance theory, the codification of the adage the enemy of my enemy is my friend and similar sayings. Unbalanced triangles are those with an odd number of negative ties, and the theory posits that s...
• On Genetic Correlation Estimation With Summary Statistics From Genome-Wide Association Studies AI翻译
  作者：Zhao, Bingxin; Zhu, Hongtu
  作者单位：University of North Carolina; University of North Carolina Chapel Hill
  摘要：Cross-trait polygenic risk score (PRS) method has gained popularity for assessing genetic correlation of complex traits using summary statistics from biobank-scale genome-wide association studies (GWAS). However, empirical evidence has shown a common bias phenomenon that highly significant cross-trait PRS can only account fora very small amount of genetic variance (R-2 can be < 1%) in independent testing GWAS. The aim of this paper is to investigate and address the bias phenomenon of cross-tra...
• Semiparametric Estimation of the Distribution of Episodically Consumed Foods Measured With Error AI翻译
  作者：Lemyre, Felix Camirand; Carroll, Raymond J.; Delaigle, Aurore
  作者单位：University of Sherbrooke; University of Sherbrooke; Texas A&M University System; Texas A&M University College Station; University of Technology Sydney; University of Melbourne; University of Melbourne
  摘要：Dietary data collected from 24-hour dietary recalls are observed with significant measurement errors. In the nonparametric curve estimation literature, much of the effort has been devoted to designing methods that are consistent under contamination by noise, and which have been traditionally applied for analyzing those data. However, some foods such as alcohol or fruits are consumed only episodically, and may not be consumed during the day when the 24-hour recall is administered. These so-call...
• Embedding Learning AI翻译
  作者：Dai, Ben; Shen, Xiaotong; Wang, Junhui
  作者单位：University of Minnesota System; University of Minnesota Twin Cities; City University of Hong Kong
  摘要：Numerical embedding has become one standard technique for processing and analyzing unstructured data that cannot be expressed in a predefined fashion. It stores the main characteristics of data by mapping it onto a numerical vector. An embedding is often unsupervised and constructed by transfer learning from large-scale unannotated data. Given an embedding, a downstream learning method, referred to as a two-stage method, is applicable to unstructured data. In this article, we introduce a novel...
• Modeling the Marked Presence-Only Data: A Case Study of Estimating the Female Sex Worker Size in Malawi AI翻译
  作者：Laga, Ian; Niu, Xiaoyue; Bao, Le
  作者单位：Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park
  摘要：Certain subpopulations like female sex workers (FSW), men who have sex with men (MSM), and people who inject drugs (PWID) often have higher prevalence of HIV/AIDS and are difficult to map directly due to stigma, discrimination, and criminalization. Fine-scale mapping of those populations contributes to the progress toward reducing the inequalities and ending the AIDS epidemic. In 2016 and 2017, the PLACE surveys were conducted at 3290 venues in 20 out of the total 28 districts in Malawi to est...