Search results for " Statistical"
showing 10 items of 1649 documents
Spatio-Temporal Modeling of Zika and Dengue Infections within Colombia
2018
The aim of this study is to estimate the parallel relative risk of Zika virus disease (ZVD) and dengue using spatio-temporal interaction effects models for one department and one city of Colombia during the 2015&ndash
Is routine second-look endoscopy effective after endoscopic hemostasis in acute peptic ulcer bleeding? A meta-analysis
2012
Background Routine second-look endoscopy in modern-era peptic ulcer bleeding (PUB) remains controversial. Objective To assess the effectiveness of routine second-look endoscopy in patients with PUB exhibiting high-risk stigmata after standard medical care and endoscopic therapy. Design Comprehensive literature searches (1990-2011) were performed, seeking randomized trials comparing a routine with an as-needed second endoscopy. Main Outcome Measurements The main outcome was rebleeding. Secondary outcomes were surgery and mortality. Subanalyses assessed the influence of study quality, rebleeding definitions, endoscopic hemostasis modality, and proton pump inhibitor (PPI) therapies. Analyses w…
Rotation-Invariant Texture Retrieval via Signature Alignment Based on Steerable Sub-Gaussian Modeling
2008
This paper addresses the construction of a novel efficient rotation-invariant texture retrieval method that is based on the alignment in angle of signatures obtained via a steerable sub-Gaussian model. In our proposed scheme, we first construct a steerable multivariate sub-Gaussian model, where the fractional lower-order moments of a given image are associated with those of its rotated versions. The feature extraction step consists of estimating the so-called covariations between the orientation subbands of the corresponding steerable pyramid at the same or at adjacent decomposition levels and building an appropriate signature that can be rotated directly without the need of rotating the im…
The relaxation dynamics of a simple glass former confined in a pore
2000
We use molecular dynamics computer simulations to investigate the relaxation dynamics of a binary Lennard-Jones liquid confined in a narrow pore. We find that the average dynamics is strongly influenced by the confinement in that time correlation functions are much more stretched than in the bulk. By investigating the dynamics of the particles as a function of their distance from the wall, we can show that this stretching is due to a strong dependence of the relaxation time on this distance, i.e. that the dynamics is spatially very heterogeneous. In particular we find that the typical relaxation time of the particles close to the wall is orders of magnitude larger than the one of particles …
The Safety Culture Enactment Questionnaire (SCEQ): Theoretical model and empirical validation
2015
This paper presents the Safety Culture Enactment Questionnaire (SCEQ), designed to assess the degree to which safety is an enacted value in the day-to-day running of nuclear power plants (NPPs). The SCEQ is based on a theoretical safety culture model that is manifested in three fundamental components of the functioning and operation of any organization: strategic decisions, human resources practices, and daily activities and behaviors. The extent to which the importance of safety is enacted in each of these three components provides information about the pervasiveness of the safety culture in the NPP. To validate the SCEQ and the model on which it is based, two separate studies were carried…
Revista electrónica de investigación y evaluación educativa
2014
Resumen basado en el de la publicación Título, resumen y palabras clave en inglés y español Se analiza el estatus del género existente en los equipos o consejos editoriales de las revistas científicas españolas de Educación. A priori, se indaga el estatus de la eminencia científica en el campo de la Educación; con el fin de detectar los posibles sesgos de género. Como análisis complementario se considera la nacionalidad o procedencia de los miembros de los consejos editoriales de las revistas de Educación. El hallazgo principal testimonia un fuerte sesgo contra las mujeres cuando éstas son consideradas editoras. Valencia ESP
The Multilevel Model in the Computer-Generated Appraisal: A Case in Palermo
2017
The construction of a mass appraisal model requires the preliminary study of the real estate market, the sampling of sold properties, the development of a forecasting model and the verification of the appraisal results. They are generally computerised methods, that work with geo-referenced data. This experimental work has proceeded to build a mass appraisal model, collecting a data sample of sales of apartments in the city of Palermo, in the five years 2008–2012, using a multivariate statistical model (multilevel), testing the results and providing the operating applications in a scheme of online real estate valuations.
Génèse et évolution des compétences des élèves à la fin de l'école maternelle : éléments d'analyse à partir de données de panel et d'une expérimentat…
2012
We propose to study in this thesis, a key issue and relatively little discussed in the French research in educational sciences, it concerns the genesis of pupil learning and their evolution during the tuition. We mobilize a longitudinal data (Panel 1997) and the results of a musical experimentation in kindergarten to answer to these questions: How are structured the first acquisitions of pupils and how is it linked to the school context and socio-economic variables? How the cognitive abilities of students affect their academic performance? Are specific activities can improve academic skills through an increase in cognitive abilities? Implicative analysis conducted on panel data has revealed…
Development of the insight scale for affective disorders (ISAD): modification from the scale to assess unawareness of mental disorder.
2011
Abstract Background Research on insight in patients with mood disorders has grown in recent years. Several instruments to assess insight have been used, but most of them have been specifically designed for psychosis and may not appear relevant to mood disorders. The aim of the present study is to develop a short, multidimensional, reliable and valid scale to measure insight in patients with mood disorders, based on the Amador's Scale to Assess Unawareness of Mental Disorders (SUMD). Method A Delphi method was used to facilitate expert participation and ensure face and content validity. The SUMD structure and items were used as a reference in the scale development. A new scale with 17 items …
The Core Self-Evaluation Scale: Psychometric properties of the German version in a representative sample
2014
The Core Self-Evaluation Scale (CSES) is an economical self-reporting instrument that assesses fundamental evaluations of self-worthiness and capabilities. The broad aims of this study were to test the CSES's psychometric properties. The study is based on a representative survey of the German general population. Confirmatory factor analyses were conducted for different models with 1, 2, and 4 latent factors. The CSES was found to be reliable and valid, as it correlated as expected with measures of depression, anxiety, quality of life, self-report health status, and pain. A 2-factor model with 2 related factors (r = -.62) showed the best model fit. Furthermore, the CSES was measurement invar…