Search results for " cluster analysis."

VIII Colloque International –VIII International Conference - A.S.I. Analyse Statistique Implicative ––Statistical Implicative Analysis

2015

Le huitième colloque A.S.I. 8 s’est déroulé dans un contexte d’espérance stimulée pour la démocratie tunisienne avec l’attribution du Prix Nobel de la Paix pour 2015. Comme on a pu le lire dans les journaux : « Le comité Nobel norvégien a décidé de récompenser, vendredi 9 octobre 2015, le quartet menant le dialogue national en Tunisie, qui s’est distingué pour «sa contribution décisive dans la construction d’une démocratie pluraliste en Tunisie après la “révolution du jasmin” de 2011 » ». (Le Monde) Un tel contexte est de toute évidence plus propice à la créativité scientifique, à l’exercice de la pensée critique qui fonde les dimensions épistémologique et méthodologique des champs scientif…

VI Colloque International –VI International Conference - A.S.I. Analyse Statistique Implicative ––Statistical Implicative Analysis

2012

Endotyping Seasonal Allergic Rhinitis in Children: A Cluster Analysis.

2022

BackgroundSeasonal Allergic Rhinitis (SAR) is a heterogeneous inflammatory disease. We hypothesized that a cluster analysis based on the evaluation of cytokines in nasal lavage (NL) could characterize distinctive SAR endotypes in children.MethodsThis cross-sectional study enrolled 88 children with SAR. Detailed medical history was obtained by well-trained physicians. Quality of life and sleep quality were assessed through standardized questionnaires [Pediatric Rhinoconjunctivitis Quality of Life Questionnaire (PRQLQ) and Pittsburgh Sleep Quality Index (PSQI) respectively]. Children were grouped through K-means clustering using Interleukin (IL)-5, IL-17, IL-23, and Interferon (INF)-γ in NL.R…

Population structure in the Méditerranean basin: a Y chromosome perspective

2006

The Mediterranean region has been characterised by a number of pre-historical and historical demographic events whose legacy on the current genetic landscape is still a matter of debate. In order to investigate the degree of population structure across the Mediterranean, we have investigated Y chromosome variation in a large dataset of Mediterranean populations, 11 of which are first described here. Our analyses identify four main clusters in the Mediterranean that can be labelled as North Africa, Arab, Central-East and West Mediterranean. In particular, Near Eastern samples tend to separate according to the presence of Arab Y chromosome lineages, suggesting that the Arab expansion played a…

Pheno-morphological and agronomic diversity among Scorpiurus muricatus (Fabaceae) natural populations collected in Sicily.

2009

SUMMARYPrickly scorpion's tail (Scorpiurus muricatus L.) is a self-reseeding annual legume widely distributed in natural pastures of the Mediterranean area and appreciated by farmers for its productivity, forage quality and palatability. Twenty-eight natural populations were collected throughout Sicily in 2005; two field experiments were carried out in 2005/06 in a hilly area of the Sicilian inland to assess the genetic variation based on pheno-morphological and agronomic characters. The pheno-morphological traits observed were analysed using a principal component analysis (PCA). The first four components of PCA (eigenvalues >1) explained 0·84 of the total variation. Similarities obtaine…

A study of personality subtypes in treatment seeking obese patients

2014

Previous research has not been able to identify a distinct personality style that refers specifically to obese individuals. The purpose of this investigation was to explore whether different personality-based groups can be identified in obese individuals, as has been shown with eating disorder patients. Data were collected from 149 obese patients (BMI = 37.3, ± 6.4; 83% female) seeking dietary treatment and psychological support for their weight problems. Participants completed the Millon Clinical Multiaxial Inventory III (MCMI-III; Millon, 1997) and a battery of eight measures assessing psychological distress, mood states, eating behaviors, obesity-related quality of life, and interperson…

L'isola che se ne va

2020

Le università rivestono un ruolo fondamentale per un territorio, oltre ad essere un luogo di alta formazione e quindi di creazione di capitale umano, la letteratura ha evidenziato che tali istituzioni attraverso il knowledge spillover possono talvolta rappresentare il motore dell’innovazione e quindi dello sviluppo economico (Wolfe 2005). Nonostante queste importanti funzioni, per garantirsi le risorse necessarie a portare avanti la propria attività le università italiane hanno un crescente bisogno di sviluppare la propria capacità di allargare il bacino di attrazione degli studenti, in quanto: i) parte della quota base del Fondo di Funzionamento Ordinario (FFO) ricevuta dal Ministero dell’…

Wild Sicilian Rosemary: Phytochemical and Morphological Screening and Antioxidant Activity Evaluation of Extracts and Essential Oils

2015

To identify the best biotypes, an extensive survey of Sicilian wild rosemary was carried out by collecting 57 samples from various sites, followed by taxonomic characterization from an agronomic perspective. All the biotypes collected were classified as Rosmarinus officinalis L. A cluster analysis based on the morphological characteristics of the plants allowed the division of the biotypes into seven main groups, although the characteristics examined were found to be highly similar and not area-dependent. Moreover, all samples were analyzed for their phytochemical content, applying an extraction protocol to obtain the nonvolatile components and hydrodistillation to collect the essential oil…

Multivariate analyses for the study of behavior: an integrated approach

2008

Simple quantitative evaluations of isolate behavioral elements (i.e. frequencies, durations, per cent distributions) are not representative of the whole behavioral structure [1]. As suggested in a landmark paper from Spruijt and Gispen [2], it is only through the evaluation of the inter-relations among behavioral elements that it is possible to explore behavior from very different points of view, greatly beyond what the human eye can intuitively interpret. In the present paper a brief outline of different multivariate techniques for behavioral analyses will be presented in the attempt to underline the feasibility of their integration.

Non-Hierarchical Clustering as a method to analyse an open-ended questionnaire on algebraic thinking

2016

The problem of taking a data set and separating it into subgroups, where the members of each subgroup are more similar to each other than they are to members outside the subgroup, has been extensively studied in science and mathematics education research. Student responses to written questions and multiple-choice tests have been characterised and studied using several qualitative and/or quantitative analysis methods. However, there are inherent difficulties in the categorisation of student responses in the case of open-ended questionnaires. Very often, researcher bias means that the categories picked out tend to find the groups of students that the researcher is seeking out. In this paper, …