Search results for "divergence"
showing 10 items of 257 documents
The Role of Agency Theory and Perceived Goal Divergence in IS Continuance: A Replication and Extension Study
2016
Past literature recognizes the power of the well-established information systems continuance theory (ISCT) to explain information systems (IS) continuance. In this study, we integrate constructs from two additional perspectives and discuss their interdependencies with ISCT. We argue that the promising framework proposed by Sorebo et al. [1], which extends ISCT with self-determination theory (SDT), can increase its managerial relevance by adding the variables of users' perceptions of goal divergence and risk aversion, selected from agency theory. The empirical results support Sorebo et al.'s main findings and strongly support the impact of perceived goal divergence on e-learning continuance …
Variance estimation and asymptotic confidence bands for the mean estimator of sampled functional data with high entropy unequal probability sampling …
2013
For fixed size sampling designs with high entropy it is well known that the variance of the Horvitz-Thompson estimator can be approximated by the H\'ajek formula. The interest of this asymptotic variance approximation is that it only involves the first order inclusion probabilities of the statistical units. We extend this variance formula when the variable under study is functional and we prove, under general conditions on the regularity of the individual trajectories and the sampling design, that we can get a uniformly convergent estimator of the variance function of the Horvitz-Thompson estimator of the mean function. Rates of convergence to the true variance function are given for the re…
Image Quality Assessment Based on Intrinsic Mode Function Coefficients Modeling
2011
Reduced reference image quality assessment (RRIQA) methods aim to assess the quality of a perceived image with only a reduced cue from its original version, called ”reference image”. The powerful advantage of RR methods is their ”General-purpose”. However, most introduced RR methods are built upon a non-adaptive transform models. This can limit the scope of RR methods to a small number of distortion types. In this work, we propose a bi-dimensional empirical mode decomposition-based RRIQA method. First, we decompose both, reference and distorted images, into Intrinsic Mode Functions (IMF), then we use the Generalized Gaussian Density (GGD) to model IMF coefficients. Finally, the distortion m…
Image Quality Assessment Measure Based on Natural Image Statistics in the Tetrolet Domain
2012
This paper deals with a reduced reference (RR) image quality measure based on natural image statistics modeling. For this purpose, Tetrolet transform is used since it provides a convenient way to capture local geometric structures. This transform is applied to both reference and distorted images. Then, Gaussian Scale Mixture (GSM) is proposed to model subbands in order to take account statistical dependencies between tetrolet coefficients. In order to quantify the visual degradation, a measure based on Kullback Leibler Divergence (KLD) is provided. The proposed measure was tested on the Cornell VCL A-57 dataset and compared with other measures according to FR-TV1 VQEG framework.
The Duality of Entropy/Extropy, and Completion of the Kullback Information Complex
2018
The refinement axiom for entropy has been provocative in providing foundations of information theory, recognised as thoughtworthy in the writings of both Shannon and Jaynes. A resolution to their concerns has been provided recently by the discovery that the entropy measure of a probability distribution has a dual measure, a complementary companion designated as &ldquo
A New Image Distortion Measure Based on Natural Scene Statistics Modeling
2012
In the field of Image Quality Assessment (IQA), this paper examines a Reduced Reference (RRIQA) measure based on the bi-dimensional empirical mode decomposition. The proposed measure belongs to Natural Scene Statistics (NSS) modeling approaches. First, the reference image is decomposed into Intrinsic Mode Functions (IMF); the authors then use the Generalized Gaussian Density (GGD) to model IMF coefficients distribution. At the receiver side, the same number of IMF is computed on the distorted image, and then the quality assessment is done by fitting error between the IMF coefficients histogram of the distorted image and the GGD estimate of IMF coefficients of the reference image, using the …
Pliocene colonization of the Mediterranean by Great White Shark inferred from fossil records, historical jaws, phylogeographic and divergence time an…
2020
Aim: Determine the evolutionary origin of the heretofore poorly characterized contemporary Great White Shark (GWS; Carcharodon carcharias) of the Mediterranean Sea, using phylogenetic and dispersal vicariance analyses to trace back its global palaeo-migration pattern. Location: Mediterranean Sea. Taxon: Carcharodon carcharias. Methods: We have built the largest mitochondrial DNA control region (CR) sequence dataset for the Mediterranean GWS from referenced historical jaws spanning the 19th and 20th centuries. Mediterranean and global GWS CR sequences were analysed for genetic diversity, phylogenetic relationships and divergence time. A Bayes factor approach was used to assess two scenarios …
Molecular phylogeny of the Notostraca
2012
Abstract We used a combined analysis of one nuclear (28S rDNA) and three mitochondrial markers (COI, 12S rDNA, 16S rDNA) to infer the molecular phylogeny of the Notostraca, represented by samples from the six continents that are inhabited by this group of branchiopod crustaceans. Our results confirm the monophyly of both extant notostracan genera Triops and Lepidurus with good support in model based and maximum parsimony analyses. We used branchiopod fossils as a calibration to infer divergence times among notostracan lineages and accounted for rate heterogeneity among lineages by applying relaxed-clock models. Our divergence date estimates indicate an initial diversification into the gener…
The agreement of existential haber in three varieties of spoken Spanish
2020
Abstract This paper aims to present one of the most relevant linguistic phenomena of spoken Spanish on both sides of the Atlantic. The singular/plural forms of the verb haber with existential meaning have received considerable attention due to the fact that it is a linguistic variable that changes according to the variety of Spanish that is used. We report the findings from the research carried out within three speech communities: Valencia, Las Palmas and Mexico City, analysing the internal and external factors that may explain this linguistic variation. For this study we have selected these communities because all the data have been obtained according to the guidelines proposed in the PRES…
Theory and Practice in the Cognitive Psychotherapies: Convergence and Divergence
2010
Cognitive therapy, linguistic therapy of evaluation, and constructivist psychotherapy display prominent points of both convergence and divergence at conceptual and practical levels. This article considers these comparisons and contrasts, focusing on their respective positions regarding their meta-theoretical models of human beings, science, and epistemology, as well as key aspects of their therapeutic stance, style, and strategic preferences. The resulting analysis suggests that these three contemporary approaches to cognitive therapy make distinctive contributions to clinical practice, adding to the richness of the field in different ways.