Results 21 to 30 of about 100,609 (297)

Alcohol Use and Gamma-Glutamyltransferase Using a Mendelian Randomization Design in the Guangzhou Biobank Cohort Study. [PDF]

PLoS ONE, 2015
Observational studies and small intervention studies suggest alcohol raises gamma-glutamyltransferase (GGT). We used Mendelian randomization to assess the causal effect of alcohol use on GGT in older Chinese people.An instrumental variable (IV) analysis ...
Lin Xu, Chao Qiang Jiang, Kar Keung Cheng, Shiu Lun Ryan Au Yeung, Wei Sen Zhang, Tai Hing Lam, Catherine Mary Schooling   +6 more
doaj   +1 more source

Weighted bootstrap for U-statistics

Journal of Multivariate Analysis, 2004
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Wang, QY, Jing, Bing Yi
openaire   +3 more sources

Predictability of cryptocurrency returns: evidence from robust tests

Dependence Modeling, 2022
The paper provides a comparative empirical study of predictability of cryptocurrency returns and prices using econometrically justified robust inference methods.
He Siyun, Ibragimov Rustam
doaj   +1 more source

Conditional $U$-Statistics

The Annals of Probability, 1991
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Asymptotic distributions of degenerated U-statistics

Statistical Theory and Related Fields
A degenerated U-statistic with rank 2 is known to converge in distribution to a weighted sum of independent chi-square random variables. However, a result for the asymptotic distribution of a degenerated U-statistic with rank higher than 2 is not ...
Jun Shao
doaj   +1 more source

Limiting cumulants of U-statistics

Applied Mathematics Letters, 1992
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
O'Neil, Kevin A., Redner, Richard A.
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Robust multivariate nonparametric tests for detection of two-sample location shift in clinical trials. [PDF]

PLoS ONE, 2018
This article presents and investigates performance of a series of robust multivariate nonparametric tests for detection of location shift between two multivariate samples in randomized controlled trials.
Xuejun Jiang, Xu Guo, Ning Zhang, Bo Wang, Bo Zhang   +4 more
doaj   +1 more source

Poisson limits for U-statistics

Stochastic Processes and their Applications, 2002
In the first part of the paper point processes of structure like a \(U\)-statistic with a symmetric non-negative kernel are considered and their convergence to a Poisson process is established under conditions of regularity and asymptotic independence. The result is then utilized to obtain \(\alpha \)-stable limits for \(U\)-statistics with heavy right-
Dabrowski, André R, Dehling, H.G., Mikosch, Thomas Valentin, Sharipov, Olimjon   +3 more
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U-Statistics in Stochastic Geometry [PDF]

, 2016
This survey will appear as a chapter of the forthcoming book [19]. A U-statistic of order $k$ with kernel $f:\X^k \to \R^d$ over a Poisson process is defined in \cite{ReiSch11} as$$ \sum\_{x\_1, \dots , x\_k \in ^k\_{\neq}} f(x\_1, \dots, x\_k) $$ under appropriate integrability assumptions on $f$.
Lachièze-Rey, Raphaël, Reitzner, Matthias   +1 more
openaire   +3 more sources

Enumeration of shifting U-shaped standard Young tableaux

Nantong Daxue xuebao. Ziran kexue ban, 2023
This paper studies the enumeration problem of the standard Young tableaux in the shifted U-shaped semiclosed model, which is obtained by folding the first cell of the U-shaped in the southwest corner to the northeast corner.
FU Yao; SUN Ping; JIANG Songshui
doaj   +1 more source