Search results for "multivariate"
showing 10 items of 1520 documents
Frailty and emergency surgery in the elderly: protocol of a prospective, multicenter study in Italy for evaluating perioperative outcome (The FRAILES…
2018
Improvements in living conditions and progress in medical management have resulted in better quality of life and longer life expectancy. Therefore, the number of older people undergoing surgery is increasing. Frailty is often described as a syndrome in aged patients where there is augmented vulnerability due to progressive loss of functional reserves. Studies suggest that frailty predisposes elderly to worsening outcome after surgery. Since emergency surgery is associated with higher mortality rates, it is paramount to have an accurate stratification of surgical risk in such patients. The aim of our study is to characterize the clinicopathological findings, management, and short-term outcom…
Environmental quality assessment of the Sicilian coast using a multi-disciplinary approach
2018
A multidisciplinary approach for the assessment of the environmental quality of the Sicilian coast is presented. This approach can be adopted for any Mediterranean coastline. The territory was divided into elementary areas and for each of them we reported the most important taxa, belonging to fauna and vascular, bryophytic and algal flora, from a biogeographic point of view in order to evaluate punctual and general levels of biodiversity conservation. The comparative analysis showed that the main circumsicilian islands and the carbonate promontories of the Tyrrhenian coast present the highest degree of biodiversity. The coastal lagoons located in the south-eastern Sicily, even though charac…
Identification of Defensive Performance Factors in the 2010 FIFA World Cup South Africa
2016
The aim of this study was to determine the efficacy of defensive play in elite football, to identify variables associated with the direct recovery of ball possession, and to propose a model for predicting the success of defensive transitions. We analyzed 804 transitions in the final stages of the Fedération Internationale Football Association (FIFA) World Cup 2010, and investigated the following variables using univariate, bivariate, and multivariate analyses: duration of defensive transition, possession loss zone, position of players at the start and end of the defensive transitions, defensive organization, general defensive approach, time of the match, position of defense, zone in which t…
Diagnóstico y políticas de promoción del emprendimiento en estudiantes
2015
La cada vez más saliente necesidad de contar con medidas tanto socio-económicas como educativas para desarrollar una cultura del emprendimiento hace imprescindible contar con una definición detallada del constructo, así como con una medida que permita disponer de una línea base del emprendimiento en estudiantes que facilitaría la evaluación de las intervenciones que desde el marco europeo y el gobierno estatal se propongan. El objetivo del estudio es proporcionar un conocimiento de las actitudes emprendedoras en el contexto educativo español, a partir del cual podrán realizarse implementaciones y evaluaciones de programas dedicados al fomento de la cultura y la educación emprendedora. 524 e…
CEO gender and SMEs innovativeness: evidence for Spanish businesses
2021
AbstractThis paper analyses the role of gender of the chief executive officer (CEO) on the propensity to introduce innovations using a sample of 1405 Spanish small- and medium-sized enterprises (SMEs). We examine whether there are significant differences between female- and male-led businesses in terms of their propensity to innovate, and whether these differences may be explained by factors related to the attributes of the CEO concerning risk tolerance, self-confidence, education level and cooperative behaviour. In particular, this study tests if the linkages between these managerial attributes and the propensity to innovate are influenced by the gender of the CEO. Using a multivariate pro…
Use of an artificial model of monitoring data to aid interpretation of principal component analysis
2000
Abstract An artificial data matrix of element concentrations at sampling locations was created which included six simulated gradients of correlated variables (Ca+Mg, Ni+V, Pb+Cu+Zn, Cd, Fe and K), representing a simplified model of a National survey. The data matrix model was used to explore the efficiency with which Principal Components Analysis (PCA), without and with Varimax rotation, could derive the imposed gradients. The dependence of PCA on outliers was decreased by log-transformation of data. The Components derived from non-rotated PCA were confounded by bipolar clusters and oblique gradients, both resulting in superimposition of two independent gradients on one Component. Therefore…
Volatility transmission patterns and terrorist attacks
2009
The objective of this study is to analyze volatility transmission between the US and Eurozone stock markets considering the effects of the September 11, March 11 and July 7 financial crises. In order to do this, we use a multivariate GARCH model and take into account the asymmetric volatility phenomenon, the non-synchronous trading problem and the crises themselves. Moreover, a graphical analysis of the Asymmetric Volatility Impulse-Response Functions (AVIRF) is introduced, which takes into consideration the crisis effect. Results suggest that there is bidirectional and asymmetric volatility transmission and show the different impact that terrorist attacks had on both markets. El objetivo d…
Testing for financial contagion between developed and emerging markets during the 1997 East Asian crisis
2005
In this paper we examine whether during the 1997 East Asian crisis there was any contagion from the four largest economies in the region (Thailand, Indonesia, Korea and Malaysia) to a number of developed countries (Japan, UK, Germany and France). Following Forbes and Rigobon, we test for contagion as a significant positive shift in the correlation between asset returns, taking into account heteroscedasticity and endogeneity bias. Furthermore, we improve on earlier empirical studies by carrying out a full sample test of the stability of the system that relies on more plausible (over) identifying restrictions. The estimation results provide some evidence of contagion, in particular from Japan…
Effects of the Big Five and musical genre on music-induced movement
2010
Nine-hundred-and-fifty-two individuals completed the Big Five Inventory, and 60 extreme scorers were presented with 30 music excerpts from six popular genres. Music-induced movement was recorded by an optical motion-capture system, the data from which 55 postural, kinematic, and kinetic movement features were computed. These features were subsequently reduced to five principal components of movement representing Local Movement, Global Movement, Hand Flux, Head Speed, and Hand Distance. Multivariate Analyses revealed significant effects on these components of both personality and genre, as well as several interactions between the two. Each personality dimension was associated with a differen…
Unsupervised Anomaly and Change Detection With Multivariate Gaussianization
2022
Anomaly detection (AD) is a field of intense research in remote sensing (RS) image processing. Identifying low probability events in RS images is a challenging problem given the high dimensionality of the data, especially when no (or little) information about the anomaly is available a priori. While a plenty of methods are available, the vast majority of them do not scale well to large datasets and require the choice of some (very often critical) hyperparameters. Therefore, unsupervised and computationally efficient detection methods become strictly necessary, especially now with the data deluge problem. In this article, we propose an unsupervised method for detecting anomalies and changes …