Search results for "Hypothesis"

TESTING INFORMATIONAL EFFICIENCY: THE CASE OF U.E. AND BRIC EMERGENT MARKETS

2012

Empirical finance has brought together a considerable number of studies in determining the market efficiency in terms of information in the case of an emerging financial market. Conflicting results have been generated by these researches in efficient market hypothesis (EMH), so efficiency tests in the emerging financial markets are rarely definitive in reaching a conclusion about the existence of informational efficiency. This paper tests weak-form market efficiency of eight emerging markets: four U.E emerging markets: Romania, Hungary, Czech Republic, Slovakia, Estonia and BRIC emerging markets: Brazil, Russia, India and China. The random walk hypothesis of stock exchange indices is tested…

Does Psychological Detachment From Work Protect Employees under High Intensified Job Demands?

2021

Technological acceleration is intensifying job demands (IJDs), referring to work intensification, intensified job- and career-related planning and decision-making demands, and intensified learning demands at work. IJDs mean new challenges for workers but recovery from work during off-job time through psychological detachment from work may help employees to maintain their well-being in the context of IJDs. The present study examined the associations between IJDs and emotional exhaustion and the buffering role of psychological detachment in these relationships. Cross-sectional data were collected from four Finnish trade unions in 2018 (N = 3,181). Data were analyzed by structural equation mod…

Supplementary material 1 from: Lefort M, Wratten S, Cusumano A, Varennes Y, Boyer S (2017) Disentangling higher trophic level interactions in the cab…

2018

OSR aphid mummy collection. Sampling location and size / Amplification success of mummies' DNA extracts by Illumina sequencing.

Supplementary material 3 from: Lefort M, Wratten S, Cusumano A, Varennes Y, Boyer S (2017) Disentangling higher trophic level interactions in the cab…

2018

Exploratory statistics addressing sequencing depth per country and MOTU rarefaction.

Supplementary material 2 from: Lefort M, Wratten S, Cusumano A, Varennes Y, Boyer S (2017) Disentangling higher trophic level interactions in the cab…

2018

Supporting Information 2

A hipótese e a experiência científica em educação em ciência: contributos para uma reorientação epistemológica

2002

O presente artigo desenvolve-se em torno do estatuto epistemológico da hipótese e da experimentação, numa perspectiva de transposição para o campo da Educação em Ciência. Não se trata de olhar aquela vertente pela estrita óptica dos epistemólogos, mas centrar a nossa atenção na busca e apropriação crítica de elementos fundamentadores de uma teorização para a Educação em Ciência, por sua vez também necessária para orientar práticas educacionais.In this paper we study the epistemological status of hypotheses and experimentation, not for the sake of epistemology but in order to better orient science teacher´s education and theirs teaching.

Observation of the rare B(s)(0) + decay from the combined analysis of CMS and LHCb data.

2015

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported licence.-- et al.

Modeling and Mitigating Errors in Belief Propagation for Distributed Detection

2021

We study the behavior of the belief-propagation (BP) algorithm affected by erroneous data exchange in a wireless sensor network (WSN). The WSN conducts a distributed multidimensional hypothesis test over binary random variables. The joint statistical behavior of the sensor observations is modeled by a Markov random field whose parameters are used to build the BP messages exchanged between the sensing nodes. Through linearization of the BP message-update rule, we analyze the behavior of the resulting erroneous decision variables and derive closed-form relationships that describe the impact of stochastic errors on the performance of the BP algorithm. We then develop a decentralized distribute…

An approach to hypothesis testing based on local indicators of spatio-temporal association

The detection of clustering structure in a point pattern is one of the major focus of attention in spatio-temporal data mining. For instance, statistical tools for clustering detection and identification of events belonging to clusters are welcome in epidemiology and seismology. Local second-order statistics can provide information on how an event relates to nearby events. We extend local indicators of spatial association (known as LISA functions) into the spatio-temporal context (which then will be called LISTA functions). These functions can be used for local tests in the context of case-control spatio-temporal point patterns, and are able to assess in the neighbourhood of each event if t…

Lessons learned on student engagement from the nature of pervasive socio‐digital interests and related network participation of adolescents

2021

The rise of modern socio-digital technologies has fundamentally changed the everyday environments in which young people communicate with each other and cultivate interests. To gain a more sophisticated understanding of this phenomenon, this study provides in-depth, qualitative insights into adolescents’ experiences of their socio-digital developmental ecologies. The 15 interview participants were recruited based on a previously conducted questionnaire. The semi-structured theme interview addressed the socio-digital aspects of the participants’ interest-driven behaviours and related networks with the aid of participant-generated egocentric maps. The data not only qualitatively enrich the pic…