Xiang Zhang

Works (8)

Updated: December 24th, 2024 05:01

2024 article

Real Effect or Bias? Good Practices for Evaluating the Robustness of Evidence From Comparative Observational Studies Through Quantitative Sensitivity Analysis for Unmeasured Confounding

Faries, D., Gao, C., Zhang, X., Hazlett, C., Stamey, J., Yang, S., … Dreyer, N. (2024, December 4). PHARMACEUTICAL STATISTICS, Vol. 12.

By: D. Faries *, C. Gao n , X. Zhang*, C. Hazlett *, J. Stamey *, S. Yang n , P. Ding *, M. Shan *, K. Sheffield *, N. Dreyer

author keywords: bias; causal inference; confounding; real-world evidence; sensitivity
Sources: Web Of Science, NC State University Libraries
Added: December 16, 2024

2018 journal article

TENSOR GENERALIZED ESTIMATING EQUATIONS FOR LONGITUDINAL IMAGING ANALYSIS

STATISTICA SINICA, 29(4), 1977–2005.

By: X. Zhang n, L. Li*, H. Zhou*, Y. Zhou * & D. Shen *

author keywords: Generalized estimating equations; longitudinal imaging; low rank tensor decomposition; magnetic resonance imaging; multidimensional array; tensor regression
TL;DR: The proposed GEE approach accounts for intra-subject correlation, and an imposed low-rank structure on the coefficient tensor effectively reduces the dimensionality in several tensor generalized estimating equations (GEEs). (via Semantic Scholar)
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Source: Web Of Science
Added: September 30, 2019

2016 journal article

A consistent information criterion for support vector machines in diverging model spaces

Journal of Machine Learning Research, 17.

By: X. Zhang, Y. Wu, L. Wang & R. Li

Source: NC State University Libraries
Added: August 6, 2018

2016 journal article

A new PK equivalence test for a bridging study

JOURNAL OF BIOPHARMACEUTICAL STATISTICS, 26(5), 992–1002.

By: S. Novick, X. Zhang n & H. Yang

author keywords: Bayesian posterior probability; bioequivalence; concentration-time curve; pharmacokinetics
MeSH headings : Bayes Theorem; Biological Availability; Half-Life; Humans; Pharmaceutical Preparations / analysis; Pharmacokinetics; Therapeutic Equivalency
TL;DR: An alternative metric of equivalence based on the maximum difference between PK profiles of the two formulations is proposed and it is shown that the new method provides better control over consumer’s risk. (via Semantic Scholar)
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Source: Web Of Science
Added: August 6, 2018

2016 conference paper

Data-driven personas: Constructing archetypal users with clickstreams and user telemetry

34th Annual CHI Conference on Human Factors in Computing Systems, CHI 2016, 5350–5359.

By: X. Zhang, H. Brown & A. Shankar

Source: NC State University Libraries
Added: August 6, 2018

2016 journal article

System Reliability and Component Importance Under Dependence: A Copula Approach

TECHNOMETRICS, 59(2), 215–224.

By: X. Zhang n & A. Wilson n 

author keywords: Dependent coherent system; Discrete marginal; Gaussian copula; Multi-state system
TL;DR: This work characterize the influence of dependence structures on system reliability and component importance in coherent systems with discrete marginal distributions and extends the framework to coherent multi-state system. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2015 conference paper

Data-driven personas: Constructing archetypal users with clickstreams and user telemetry

34th Annual CHI Conference on Human Factors in Computing Systems, CHI 2016, 5350–5359.

By: X. Zhang, H. Brown & A. Shankar

Source: NC State University Libraries
Added: August 6, 2018

2015 journal article

Variable selection for support vector machines in moderately high dimensions

JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES B-STATISTICAL METHODOLOGY, 78(1), 53–76.

By: X. Zhang n, Y. Wu n, L. Wang * & R. Li *

author keywords: Local linear approximation; Non-convex penalty; Oracle property; Support vector machines; Ultrahigh dimensions; Variable selection
TL;DR: It is proved that, in ultrahigh dimensions, there is one local minimizer to the objective function of non‐convex penalized SVMs having the desired oracle property and the local linear approximation algorithm is guaranteed to converge to the oracle estimator even in the ultrahigh dimensional setting if an appropriate initial estimator is available. (via Semantic Scholar)
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Source: Web Of Science
Added: August 6, 2018

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