Results 201 to 210 of about 1,095,010 (241)
Geophysical Research Letters, Volume 52, Issue 10, 28 May 2025.Abstract Climate interventions like Marine Cloud Brightening have gained attention for their potential to protect vulnerable marine ecosystems from the worst impacts of climate change. Early modeling studies raised concerns about potential harmful global side effects stemming from regional interventions. Here we propose a modeling framework to evaluate
Will Krantz, J. David Neelin, Fiaz Ahmed
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Geophysical Research Letters, Volume 52, Issue 10, 28 May 2025.Abstract Satellite radiometers like MODIS use a bi‐spectral retrieval algorithm to simultaneously retrieve cloud optical thickness and cloud effective radius re $\left({r}_{\mathrm{e}}\right)$. However, retrievals fail for liquid clouds when the re ${r}_{\mathrm{e}}$ observation exceeds the maximum threshold of 30 μ ${\upmu }$m in MODIS's solution ...
Goutam Choudhury, Tom Goren
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Umwandlung des Bestmann‐Ylids in Carbophosphinocarben
Angewandte Chemie, Volume 137, Issue 22, May 26, 2025.Das ortho‐Carboranyl‐Carbophosphinocarben (CPC) wurde durch eine Click‐Reaktion synthetisiert. Experimentelle und rechnerische Studien belegen seine bemerkenswerte Fähigkeit, Elektronen zu donieren. Reaktivitätsstudien zeigen seine Vielseitigkeit als stabilisierender Ligand, starkes Nukleophil für die CO₂‐Aktivierung und potente Brønsted‐Base für die ...
Libo Xiang +4 more
wiley +1 more source
Roadmap zur katalytischen Minderung von Per‐ und Polyfluoralkylsubstanzen (PFAS) in der Gasphase
Angewandte Chemie, Volume 137, Issue 20, May 12, 2025.Im Themenfeld der Reduzierung von PFAS‐Emissionen befasst sich dieser Übersichtsartikel mit der katalytischen Zersetzung von PFAS in der Gasphase und den übergeordneten Herausforderungen im Zusammenhang mit fundamentaler organischer und anorganischer Chemie, heterogener Katalyse und Reaktionstechnik. Zudem werden Konzepte und Arbeitsabläufe vorgestellt,
Patrick Lott, Florian Maurer, Arik Beck
wiley +1 more source
Bayesian Estimation in the Rasch Model [PDF]
Journal of Educational Statistics, 1982 Bayesian estimation procedures based on a hierarchical model for estimating parameters in the Rasch model are described. Through simulation studies it is shown that the Bayesian procedure is superior to the maximum likelihood procedure in that the estimates are (a) more accurate, at least in small samples; and (b) meaningful in that parameters ...
Hariharan Swaminathan, Janice A. Gifford
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Some of the next articles are maybe not open access.
Language Assessment Quarterly, 2016
ABSTRACTStewart questioned Beglar’s use of Rasch analysis of the Vocabulary Size Test (VST) and advocated the use of 3-parameter logistic item response theory (3PLIRT) on the basis that it models a non-zero lower asymptote for items, often called a “guessing” parameter.
Trevor A. Holster, J. Lake
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ABSTRACTStewart questioned Beglar’s use of Rasch analysis of the Vocabulary Size Test (VST) and advocated the use of 3-parameter logistic item response theory (3PLIRT) on the basis that it models a non-zero lower asymptote for items, often called a “guessing” parameter.
Trevor A. Holster, J. Lake
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2002
This paper defines a class of multivariate models combining features of Rasch type models with features of graphical interaction models into a common framework for analysis of criterion related construct validity and differential item functioning. Item analysis by Graphical Rasch models is illustrated with reanalysis of a summary Health scale counting ...
Kreiner, Svend, Christensen, Karl Bang
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This paper defines a class of multivariate models combining features of Rasch type models with features of graphical interaction models into a common framework for analysis of criterion related construct validity and differential item functioning. Item analysis by Graphical Rasch models is illustrated with reanalysis of a summary Health scale counting ...
Kreiner, Svend, Christensen, Karl Bang
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Applied Psychological Measurement, 2005
The Rasch testlet model for both dichotomous and polytomous items in testlet-based tests is proposed. It can be viewed as a special case of the multidimensional random coefficients multinomial logit model (MRCMLM). Therefore, the estimation procedures for the MRCMLM can be directly applied. Simulations were conducted to examine parameter recovery under
Mark Wilson, Wen Chung Wang
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The Rasch testlet model for both dichotomous and polytomous items in testlet-based tests is proposed. It can be viewed as a special case of the multidimensional random coefficients multinomial logit model (MRCMLM). Therefore, the estimation procedures for the MRCMLM can be directly applied. Simulations were conducted to examine parameter recovery under
Mark Wilson, Wen Chung Wang
openaire +2 more sources
2019
A category coefficient \( \kappa_{k} \) is the sum of the exceeded thresholds for response category k. The PRM can be rewritten in terms of principal components (Guttman) for the thresholds instead of the thresholds themselves. The principal component \( \lambda \) characterizes the spread of the responses, the principal component \( \eta ...
David Andrich, Ida Marais
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A category coefficient \( \kappa_{k} \) is the sum of the exceeded thresholds for response category k. The PRM can be rewritten in terms of principal components (Guttman) for the thresholds instead of the thresholds themselves. The principal component \( \lambda \) characterizes the spread of the responses, the principal component \( \eta ...
David Andrich, Ida Marais
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A Dynamic Generalization of the Rasch Model
Psychometrika, 1993In the present paper a model for describing dynamic processes is constructed by combining the common Rasch model with the concept of structurally incomplete designs. This is accomplished by mapping each item on a collection of virtual items, one of which is assumed to be presented to the respondent dependent on the preceding responses and/or the ...
N.D. Verhelst, Cornelis A.W. Glas
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