Results 161 to 170 of about 2,702 (215)

Fixed or Random Effects: Analysis of Clustered Data

Statistics in Medicine, Volume 45, Issue 18-19, August 2026.
ABSTRACT In analyzing clustered data, random effects (RE) and fixed effects (FE) models are two primary approaches. The RE model assumes that the cluster‐specific effects are random and uncorrelated with individual characteristics. If this assumption is violated, the RE approach can lead to biased estimates of the coefficients of individual covariates ...
Kevin He, Xiangeng Fang, Yubo Shao, Nicholas Hartman, John D. Kalbfleisch   +4 more
wiley   +1 more source

Comparative Assessment of Graglia-Wilton-Peterson and Rao-Wilton-Glisson Basis Functions for Radiofrequency Coil Modeling in Magnetic Resonance Imaging. [PDF]

IEEE J Multiscale Multiphys Comput Tech
Franzò D, Giannakopoulos II, Merlini A, Andriulli F, Lattanzi R.   +4 more
europepmc   +1 more source

Joint Modeling of Longitudinal Data and Potentially Informative Visiting Process to Dynamically Predict Future Visit Times

Statistics in Medicine, Volume 45, Issue 18-19, August 2026.
ABSTRACT Frequent visits in cohort studies are important as they enable, among others, the assessment of disease progression and treatment effectiveness. In HIV studies, extended intervals between visits have been shown to be associated with adverse outcomes (e.g., antiretroviral therapy interruption).
Achilleas Stamoulopoulos, Christos Thomadakis, Giota Touloumi   +2 more
wiley   +1 more source

Targetless LiDAR-camera extrinsic calibration via semantic distribution alignment. [PDF]

Front Robot AI
Chen X, Sun B.
europepmc   +1 more source

Imaging Near‐Surface Bedrock Fracturing and Fluid Pathways Using Seismic Attenuation and Velocity From Viscoacoustic Full‐Waveform Inversion of Refraction Data

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Seismic attenuation provides sensitivity to fracture density, fluid saturation, and pore geometry that complements velocity, enabling quantitative imaging of fracture architecture and associated fluid‐pathways in near‐surface bedrock. Yet high‐resolution attenuation models remain rare in refraction studies due to amplitude‐fidelity and ...
Donggeon Kim, Guangchi Xing, Tieyuan Zhu
wiley   +1 more source

Optimal interpolation methods for predicting groundwater levels in Abu Dhabi Emirate using ArcGIS. [PDF]

Sci Rep
Maksoud T, Alkhawaga A, Mohamed M.
europepmc   +1 more source

Virtual Soil Simulator—Finite Volume Method Implementation for the Unsaturated Porous Media Water Transport Model Including Film Flow and Isothermal Vapor Transport Phenomena

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 8, August 2026.
Abstract Modeling unsaturated water transport in porous media traditionally relies on the Richards equation (RE) with hydraulic conductivity formulations to consider only capillary liquid water flow. However, this simplification neglects thin water films adsorbed onto particle surfaces, which can contribute significantly to flow under medium to dry ...
M. Kozyra, K. Lamorski, C. Sławiński
wiley   +1 more source

An adaptive slicing algorithm based on model contour information. [PDF]

PLoS One
Han X, Liu X, Lu K, Cui L.
europepmc   +1 more source

Assessment of a Finite Volume Discretization of the Horizontal Pressure Gradient Force Beneath Sloping Ice Shelves

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 8, August 2026.
Abstract The accurate computation of pressure gradients in ocean models is essential for simulating ocean and climate processes. Inaccurate computation can result in spurious velocities on the order of real ocean flows, particularly in quiescent ice shelf cavities.
C. K. Yung, R. W. Hallberg, A. Adcroft, A. K. Morrison   +3 more
wiley   +1 more source

Morphological changes in smectic liquid crystal microstructures.

Soft Matter
Sato D, Sumino Y, Yamamoto T, Muševič I, Takenaka Y.   +4 more
europepmc   +1 more source