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   Articles with "assumption" as a keyword



Mendelian randomisation with coarsened exposures

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recommendations! Published in 2021 at "Genetic Epidemiology"

DOI: 10.1002/gepi.22376

Abstract: A key assumption in Mendelian randomisation is that the relationship between the genetic instruments and the outcome is fully mediated by the exposure, known as the exclusion restriction assumption. However, in epidemiological studies, the exposure… read more here.

Keywords: assumption; randomisation; exposure; mendelian randomisation ... See more keywords

Elevated Risk of Split‐Liver grafts in adult liver Transplantation: Statistical Artifact or Nature of the Beast?

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recommendations! Published in 2019 at "Liver Transplantation"

DOI: 10.1002/lt.25409

Abstract: A recent study using US national registry data reported, using Cox proportional hazards (PH) models, that split‐liver transplantation (SLT) has improved over time and is no more hazardous than whole‐liver transplantation (WLT). However, the study… read more here.

Keywords: liver transplantation; assumption; slt; time ... See more keywords

Impact of material homogeneity assumption on cortical stiffness estimates by MR elastography

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recommendations! Published in 2022 at "Magnetic Resonance in Medicine"

DOI: 10.1002/mrm.29226

Abstract: Inversion algorithms used to convert acquired MR elastography wave data into material property estimates often assume that the underlying materials are locally homogeneous. Here we evaluate the impact of that assumption on stiffness estimates in… read more here.

Keywords: homogeneity assumption; impact material; assumption; stiffness estimates ... See more keywords

Core concepts in pharmacoepidemiology: Violations of the positivity assumption in the causal analysis of observational data: Consequences and statistical approaches

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recommendations! Published in 2021 at "Pharmacoepidemiology and Drug Safety"

DOI: 10.1002/pds.5338

Abstract: In the causal analysis of observational data, the positivity assumption requires that all treatments of interest be observed in every patient subgroup. Violations of this assumption are indicated by nonoverlap in the data in the… read more here.

Keywords: assumption; analysis observational; positivity; causal analysis ... See more keywords

Evaluating accuracy of diagnostic tests without conditional independence assumption.

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recommendations! Published in 2018 at "Statistics in medicine"

DOI: 10.1002/sim.7688

Abstract: Evaluating the accuracy (ie, estimating the sensitivity and specificity) of new diagnostic tests without the presence of a gold standard is of practical meaning and has been the subject of intensive study for several decades.… read more here.

Keywords: assumption; diagnostic tests; method; conditional independence ... See more keywords

Latent class models for multiple ordered categorical health data: testing violation of the local independence assumption

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recommendations! Published in 2019 at "Empirical Economics"

DOI: 10.1007/s00181-019-01685-6

Abstract: Latent class models are now widely applied in health economics to analyse heterogeneity in multiple outcomes generated by subgroups of individuals who vary in unobservable characteristics, such as genetic information or latent traits. These models… read more here.

Keywords: health; ordered categorical; assumption; economics ... See more keywords

A latent outcome variable approach for Mendelian randomization using the stochastic expectation maximization algorithm

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recommendations! Published in 2025 at "Human Genetics"

DOI: 10.1007/s00439-025-02739-9

Abstract: Mendelian randomization (MR) is a widely used tool to uncover causal relationships between exposures and outcomes. However, existing MR methods can suffer from inflated type I error rates and biased causal effects in the presence… read more here.

Keywords: expectation maximization; pleiotropy; mendelian randomization; assumption ... See more keywords

Analysis of Planar Ornament Patterns via Motif Asymmetry Assumption and Local Connections

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recommendations! Published in 2018 at "Journal of Mathematical Imaging and Vision"

DOI: 10.1007/s10851-018-0835-8

Abstract: Planar ornaments, a.k.a. wallpapers, are regular repetitive patterns which exhibit translational symmetry in two independent directions. There are exactly 17 distinct planar symmetry groups. We present a fully automatic method for complete analysis of planar… read more here.

Keywords: planar; assumption; ornament patterns; ornament ... See more keywords

Convergence of Nonmonotone Proximal Gradient Methods under the Kurdyka-Łojasiewicz Property without a Global Lipschitz Assumption

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recommendations! Published in 2024 at "Journal of Optimization Theory and Applications"

DOI: 10.1007/s10957-025-02762-w

Abstract: We consider the composite minimization problem with the objective function being the sum of a continuously differentiable and a merely lower semicontinuous and extended-valued function. The proximal gradient method is probably the most popular solver… read more here.

Keywords: proximal gradient; gradient; kurdyka ojasiewicz; assumption ... See more keywords

A simpler and more realistic subjective decision theory

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recommendations! Published in 2017 at "Synthese"

DOI: 10.1007/s11229-017-1594-6

Abstract: In his classic book “the Foundations of Statistics” Savage develops a formal system of rational decision making. It is based on (i) a set of possible states of the world, (ii) a set of consequences,… read more here.

Keywords: decision; assumption; constant act; preference relation ... See more keywords

A revisit to the validity of flamelet assumptions in turbulent premixed combustion and implications for future research

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recommendations! Published in 2021 at "Combustion and Flame"

DOI: 10.1016/j.combustflame.2021.111635

Abstract: Abstract The flamelet assumption has been widely used for analysis and modeling of turbulent premixed flames over the past decades. Despite its popularity, validity of this assumption has been challenged originally by Borghi [1] in… read more here.

Keywords: premixed flames; research; assumption; validity ... See more keywords