Search results for " Mixed"
showing 10 items of 209 documents
Coupling Lagrangian simulation models and remote sensing to explore the environmental effect on larval growth rate: The Mediterranean case study of r…
2023
The relationship between environmental conditions and early life-history traits of Sardinella aurita are investigated using material collected in two sites of the Central Mediterranean Sea. Individual mean daily growth during the planktonic phase has been determined by using otolith microstructure analysis, while Lagrangian simulation models allowed to estimate the daily position in space and time of each specimen from the hatching to the catch. Generalized Additive Mixed Models (GAMMs) have been implemented to explore the impact of environmental conditions at time t, t-1 day and t-2 days on the mean daily growth rate occurring at time t. Spatial analysis evidenced a wide dispersion of eggs…
Variable selection in mixed models: a graphical approach
2014
Model selection can be defined as the task of estimating the performance of dif- ferent models in order to choose the (approximate) best one. The purpose of this article is to introduce an extension of the graphical representation of deviance proposed in the framework of classical and generalized linear models to the wider class of mixed models. The proposed plot is useful in determining which are the important explanatory variables conditioning on the random effects part. The applicability and the easy interpretation of the graph are illus- trated with a real data examples.
Asociación de pravastatina y fenofibrato (Pravafenix®). Estudios de seguridad
2014
Resumen Aunque el colesterol unido a lipoproteinas de baja densidad (cLDL) es el objetivo primario de tratamiento para reducir el riesgo cardiovascular, el incremento de trigliceridos y el descenso del colesterol unido a lipoproteinas de alta densidad (cHDL) constituyen el denominado riesgo cardiovascular residual. El tratamiento con estatinas asociado a fibratos es una posibilidad real de tratamiento del riesgo cardiovascular total. Sin embargo, esta asociacion puede con frecuencia asociarse a efectos adversos, especialmente musculares y hepaticos. Por sus caracteristicas farmacologicas, la asociacion de pravastatina con fenofibrato puede ser eficaz y segura, con escasos efectos secundario…
A recap on Linear Mixed Models and their hat-matrices
2017
This working paper has a twofold goal. On one hand, it provides a recap of Linear Mixed Models (LMMs): far from trying to be exhaustive, this first part of the working paper focusses on the derivation of theoretical results on estimation of LMMs that are scattered in the literature or whose mathematical derivation is sometimes missing or too quickly sketched. On the other hand, it discusses various definitions that are available in the literature for the hat-matrix of Linear Mixed Models, showing their limitations and proving their equivalence.
Overionization in X-ray spectra: a new paradigm for Mixed-Morphology SNRs
2011
Mixed-morphology SNRs are characterized by a shell-like radio emission, a centrally peaked X-ray morphology, and by interaction with molecular clouds. Many models have been proposed to explain these peculiar remnants, but their physical origin is still unclear. The recent discovery of over-ionized (i. e. recombining) ejecta in 3 mixed-morphology SNRs has dramatically challenged all the previous models and opened up new, unexpected scenarios. I review the main properties of these remnants and their peculiar X-ray spectral properties. I also discuss the hydrodynamic model developed to explain the presence of over-ionized ejecta in W49B and present a list of open issues that still need to be c…
Entanglement in continuous-variable systems: recent advances and current perspectives
2007
We review the theory of continuous-variable entanglement with special emphasis on foundational aspects, conceptual structures, and mathematical methods. Much attention is devoted to the discussion of separability criteria and entanglement properties of Gaussian states, for their great practical relevance in applications to quantum optics and quantum information, as well as for the very clean framework that they allow for the study of the structure of nonlocal correlations. We give a self-contained introduction to phase-space and symplectic methods in the study of Gaussian states of infinite-dimensional bosonic systems. We review the most important results on the separability and distillabil…
Faculty Perception of Inclusion in the University: Concept, Policies and Educational Practices
2021
European universities must face the challenge of diversity and design inclusive practices to address it as part of their social responsibility. However, not all universities are doing the same in terms of diversity practices, so it is important to gather the perceptions of the protagonists. To this end, we have analysed university faculty’s perceptions using a mixed model with a concurrent methodological strategy, including an ad hoc questionnaire validated with 880 educators, as well as 17 semi‐structured interviews. The triangulation of these two instruments allowed us to analyse three key dimensions associated with the idea of attention to diversity in the university: diversity concept o…
Affordable housing in western Europe. Forms, typologies and paradigms through a genealogical approach. 1852-2019
2022
The essay concerns housing as a major tool for urban regeneration and for experiment in architecture. Within this larger research scope, this paper aims to explore some issues linked to contemporary European processes of urban regeneration through housing in a genealogical approach. At first, will be evocated the initial European typological evolution of affordable housing, outlining the early development of the urban working-class housing estate in Paris, and London . The discussion of the two main paradigms elaborated at that foundational stage will focuses the appearance of the open block for mixed-use housing at the very end of the 19th century. Then, the article will shortly engage wit…
Elimination of spourious kinematic modes in hybrid equilibrium element
2011
It is widely recognized that displacement based elements produce solution with poor stress fields, which do not satisfy equilibrium equations. In several fields of computational mechanics, such as cohesive crack propagation and cohesive delamination, stress fields drive all the nonlinear phenomena and very fine meshes have to be employed in order to avoid numerical instabilities. Inter-element equilibrium condition is generally not satisfied and the stress field can abruptly change between adjacent elements, producing numerical instabilities in non linear analysis. Finite element formulation based on stress fields satisfying locally equilibrium condition are known in literature since 1964 b…
Geographical variation in pharmacological prescription
2009
Promoting rational drug administration in treatments is one of the most important issues in Public Health. Bayesian hierarchical models are a very useful tool for incorporating geographical information into the analysis of pharmacological prescription data. They allow the mapping of spatial components which express the trend of geographical variation. In addition, these models are able to deal with uncertainty in a sequential way through prior distributions on parameters and hyperparameters. Bayes' theorem combines all types of information and provides the posterior distribution which is computed through Markov Chain Monte Carlo (MCMC) simulation methods. Simulated data for pharmacological …