Search results for "Pls"
showing 10 items of 53 documents
Google matrix analysis of worldwide football mercato
2018
[EN] The worldwide football transfer market is analyzed as a directed complex network: the football clubs are the network nodes and the directed edges are weighted by the total amount of money transferred from a club to another. The Google matrix description allows to treat every club independently of their richness and allows to measure for a given club the efficiency of player sales and player acquisitions. The PageRank algorithm, developed initially for the World Wide Web, naturally characterizes the ability of a club to import players. The CheiRank algorithm, also developed to analyze large scale directed complex networks, characterizes the ability of a club to export players. The analy…
Evaluation of the effect of chance correlations on variable selection using Partial Least Squares -Discriminant Analysis
2013
Variable subset selection is often mandatory in high throughput metabolomics and proteomics. However, depending on the variable to sample ratio there is a significant susceptibility of variable selection towards chance correlations. The evaluation of the predictive capabilities of PLSDA models estimated by cross-validation after feature selection provides overly optimistic results if the selection is performed on the entire set and no external validation set is available. In this work, a simulation of the statistical null hypothesis is proposed to test whether the discrimination capability of a PLSDA model after variable selection estimated by cross-validation is statistically higher than t…
Innovativeness as a determinant of entrepreneurial orientation: analysis of the hotel sector
2019
This paper analyses entrepreneurial orientation as a composite formed of innovation, proactiveness and risk-taking. The empirical data for this study were gathered from a survey sent to hotel managers. The fieldwork was carried out between January and June 2018. The process provided 102 valid questionnaires. Two methods were used: structural equation modelling (PLS-SEM) and fuzzy-set qualitative comparative analysis (fsQCA). This study makes six key contributions and findings. First, the use of these two methods provides robust and reliable results. Second, reliability and validity values for innovativeness, proactiveness and risk-taking are satisfactory. Third, the operationalisation of en…
Eco-Friendly Estimation of Heavy Metal Contents in Grapevine Foliage Using In-Field Hyperspectral Data and Multivariate Analysis
2019
Heavy metal monitoring in food-producing ecosystems can play an important role in human health safety. Since they are able to interfere with plants’ physiochemical characteristics, which influence the optical properties of leaves, they can be measured by in-field spectroscopy. In this study, the predictive power of spectroscopic data is examined. Five treatments of heavy metal stress (Cu, Zn, Pb, Cr, and Cd) were applied to grapevine seedlings and hyperspectral data (350−2500 nm), and heavy metal contents were collected based on in-field and laboratory experiments. The partial least squares (PLS) method was used as a feature selection technique, and multiple linear regressions (…
Evaluating Assessment. Validation with PLS-SEM of ATAE Scale for the Analysis of Assessment Tasks
2020
One of the essential functions of university teachers lies in the decision-making process regarding the various components included in assessment process design, where the quality of assessment tasks is a key aspect. This study presents both validation of an instrument for students to evaluate the assessment tasks and the model that upholds the relationships between constructs that characterise the assessment tasks. Working from a review of the literature, a theoretical model has been devised featuring the characteristics of the assessment tasks and the relationships between them. The Analysis of the Assessment and Learning Tasks questionnaire (ATAE) has been designed to check them, based o…
Retail brand equity: a model based on its dimensions and effects
2013
International audience; Brand equity has been recognized as a key variable in both the academic and professional literature. This article aims to deepen the nature of the retailer equity construct and identify the variables that contribute to its formation, proposing an integrative model based on their dimensions and effects. From an empirical perspective, a survey is carried out with 300 consumers in three retailer categories, in order to analyze the relationships of the model. Due to the formative nature of two of the constructs, the analysis is developed through the partial least squares technique. From the analysis of the results, the importance of store image, perceived store value, an…
Chemometrics as a Tool of Origin Determination of Polish Monofloral and Multifloral Honeys
2014
The aim of this study was to evaluate the application of chemometrics studies to determine the botanical origin of Polish monofloral honeys using NMR spectroscopy. Aqueous extracts of six kinds of honeys, namely, heather (Calluna vulgaris L.), buckwheat (Fagopyrum esculentum L), lime (Tilia L), rape (Brassica napus L. var. napus), acacia (Acacia Mill.), and multifloral ones, were analyzed. Multivariate chemometric data analysis was performed using principal component analysis (PCA) and orthogonal partial least-squares discriminant analysis (OPLS-DA). Chemometric analysis supported by pollen analysis revealed the incorrect classification of acacia honeys by the producers. Characteristic moti…
Managers’ and consumers’ representations of the closeness to a store : a contribution to retailer strategy
2013
Getting close to the consumer is one major concern in retailing. This research tries to understand the rehabilitation of small food stores in the French retailing context and explores the notion of closeness in all in its dimensions from a retailer as well as a consumer perspective. The research involves data collection from both retail companies and consumers. The qualitative and quantitative analysis show that creating closeness with the customer can be defined as the management of the spatial, temporal, functional and social distance that links a store to its customers. Seven dimensions can be identified: the access closeness, the functional closeness, the process closeness, the relation…
Sentiment Analysis of Twitter in Tourism Destinations
2020
[EN] Given the importance of electronic word of mouth (eWOM), this paper analyses the content of messages generated by users related to a tourist destination and shared through Twitter. We propose three research questions regarding eWOM behaviour in Twitter focused on the expertise of the reviewer, sentiment analysis of a tweet and its content.In order to address those research questions we carry out text mining analysis by retrieving existing information on Twitter (over 1500 tweets) regarding to Venice as a tourist destination.
El entorno del servicio -Artscape- y su influencia en el comportamiento del asistente de artes escénicas
2015
La presente tesis doctoral propone un modelo teórico que explica la relación entre el servicescape y la respuesta del consumidor en términos de valor percibido, satisfacción y lealtad, con el añadido de interpretar estas relaciones a través del papel moderador que ejercen las emociones. Para nuestro análisis del servicescape, éste se ha definido como un constructo de tercer orden compuesto formativamente por dos dimensiones: la referente a las características físicas –elementos exteriores e interiores- y la referente a aquellas cuestiones relacionadas con la relación social establecida entre los actores de la prestación del servicio, es decir, consumidores y organización –características de…