Results 11 to 20 of about 9,800 (195)

Bias Reduction in Robust Mean–Geometric Mean Linking via SIMEX

Algorithms
Robust mean–geometric mean (MGM) linking is a method for comparing the performance of two groups on a test involving dichotomous items and is particularly suited to settings with fixed and sparse differential item functioning (DIF).
Alexander Robitzsch
doaj   +1 more source

Physical properties of the African walnut (Tetracarpidium conophorum) from Nigeria

Cogent Food & Agriculture, 2016
In this research about 1,700 samples of the African walnut (Tetracarpidium conophorum) were measured for their axial dimensions, mass, geometric mean, sphericity index, surface area, aspect ratios, angle of repose on steel, wood and glass, porosity, bulk
M.C. Ndukwu, C. Ejirika
doaj   +1 more source

Prolonged job strain reduces time-domain heart rate variability on both working and resting days among cardiovascular-susceptible nurses

International Journal of Occupational Medicine and Environmental Health, 2015
Introduction Modifications of hearth rate variability (HRV) constitute a marker of the autonomic nervous system (ANS) deregulation, a promising pathway linking job strain (JS) and cardiovascular diseases (CVD).
Rossana Borchini, Lorenza Bertù, Marco M. Ferrario, Giovanni Veronesi, Matteo Bonzini, Marco Dorso, Giancarlo Cesana   +6 more
doaj   +1 more source

General Framework for Georeferencing and Interpretation of Multi-Resolution LiDAR Data for Fine-Scale Forest Inventory [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Accurate forest inventory is critical for sustainable management, ecological assessment, and biomass estimation. Combining near-proximal and proximal Light Detection and Ranging (LiDAR) data produces point clouds that fully capture the forest structure ...
H. Hanafy, S.-Y. Shin, A. M. Eissa, Y. Hany, S. Park, S. Fei, A. Habib   +6 more
doaj   +1 more source

Robust-Mean–Geometric-Mean and Robust Haberman Linking with Invariant Item Discriminations Under Sparse Differential Item Functioning

Mathematics
Comparison of two or multiple groups based on dichotomous items is a central task in item response theory (IRT) linking. This article considers the two-parameter logistic scaling model under sparse differential item functioning (DIF) in item intercepts ...
Alexander Robitzsch
doaj   +1 more source

Geometric mean IELT and premature ejaculation: appropriate statistics to avoid overestimation of treatment efficacy

, 2008
INTRODUCTION: The intravaginal ejaculation latency time (IELT) behaves in a skewed manner and needs the appropriate statistics for correct interpretation of treatment results. AIMS: To explain the rightful use of geometrical mean IELT values and the fold
Zwinderman, Aeilko H., Dave H. Schweitzer, Aeilko H. Zwinderman, Berend Olivier, Waldinger, Marcel D., Olivier, Berend, Marcel D. Waldinger, Schweitzer, Dave H.   +7 more
core   +1 more source

Mean Comparisons of Many Groups in the Presence of DIF: An Evaluation of Linking and Concurrent Scaling Approaches

, 2023
One of the primary goals of international large-scale assessments (ILSAs) in education is the comparison of country means in student achievement. The present article introduces a framework for discussing differential item functioning (DIF) for such mean ...
Alexander Robitzsch, Oliver Lüdtke
core   +1 more source

Halpin’s Differential Test Functioning via Robust Linking: A Comparison of Bisquare and L₀ Loss Functions

Information
Differential test functioning (DTF) assesses, within an item response model, whether differential item functioning (DIF) affects the test as a whole.
Alexander Robitzsch
doaj   +1 more source

Physiologically Based Pharmacokinetic/Pharmacodynamic Modeling to Predict the Impact of CYP2C9 Genetic Polymorphisms, Co-Medication and Formulation on the Pharmacokinetics and Pharmacodynamics of Flurbiprofen

Pharmaceutics, 2020
Physiologically based pharmacokinetic/pharmacodynamic (PBPK/PD) models can serve as a powerful framework for predicting the influence as well as the interaction of formulation, genetic polymorphism and co-medication on the pharmacokinetics and ...
Ioannis Loisios-Konstantinidis, Rodrigo Cristofoletti, Masoud Jamei, David Turner, Jennifer Dressman   +4 more
doaj   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source