Search results for "Correspondence analysis"

The importance of sedimenting organic matter, relative to oxygen and temperature, in structuring lake profundal macroinvertebrate assemblages

2012

We quantified the role of a main food resource, sedimenting organic matter (SOM), relative to oxygen (DO) and temperature (TEMP) in structuring profundal macroinvertebrate assemblages in boreal lakes. SOM from 26 basins of 11 Finnish lakes was analysed for quantity (sedimentation rates), quality (C:N:P stoichiometry) and origin (carbon stable isotopes, δ13C). Hypolimnetic oxygen and temperature were measured from each site during summer stratification. Partial canonical correspondence analysis (CCA) and partial regression analyses were used to quantify contributions of SOM, DO and TEMP to community composition and three macroinvertebrate metrics. The results suggested a major contribution o…

"Learning Online" for Vocational Teachers : Visualisation of a Competence-Based Approach in Digital Open Badge-Driven Learning

2018

Vocational education in Finland is based on competence-based qualification requirements. Meanwhile, digital open badges promote competence-based assessment and shared expertise in digital environments. The educational setting supports gamified learning solutions and enhances student motivation. The current study aims to examine how learners experience the competence-based approach in the badge-driven learning process of professional development. The theoretical framework focuses on the concept of instructional badging in the competence-based approach. Coordinated by the country’s northernmost school of profesional teacher education, “Learning Online” is a national professional development p…

Beyond Tandem Analysis: Joint Dimension Reduction and Clustering in R

2019

We present the R package clustrd which implements a class of methods that combine dimension reduction and clustering of continuous or categorical data. In particular, for continuous data, the package contains implementations of factorial K-means and reduced K-means; both methods combine principal component analysis with K-means clustering. For categorical data, the package provides MCA K-means, i-FCB and cluster correspondence analysis, which combine multiple correspondence analysis with K-means. Two examples on real data sets are provided to illustrate the usage of the main functions.

Distribution, ecology and conservation status of Dionysia involucrata Zaprjag., an endangered endemic of Hissar Mts (Tajikistan, Middle Asia)

2014

<em>Dionysia involucrata</em> Zaprjag. (Primulaceae) is known as critically endangered endemic species of Hissar Mountains in Tajikistan. It is reported from few localities mainly in Varzob River valley and its tributaries. The species inhabits steep or overhanging faces of granite rocks in narrow river gorges. During the research all known populations of <em>D. involucrata</em> were examined in respect of the habitat conditions and species composition of vegetation plots. We analyzed the population extent of the species in its range in Tajikistan and the main threats in order to assess its conservation status. The detrended correspondence analysis was performed on a…

Are there similar or divergent transitions to adulthood in a Mediterranean context? A cross-national comparison of Italy and Spain

2016

The purpose of this study was to examine the differences and similarities between Italy and Spain in regard to emerging adults’ perceptions of identity status, autonomy, attachment, and life satisfaction. The goal was to verify whether a Mediterranean model of transitions from adolescence to adulthood exists. Three hundred and forty undergraduate students (171 Italians and 169 Spanish) ranging in age from 19 to 22 completed measures of identity status, emotional autonomy, attachment style, and life satisfaction. Multiple correspondence analyses provided a graphic synthesis of results. The results indicate that no common model of young adult development exists in Spain and Italy and that Ita…

Appropriateness in Dentistry: A Survey Discovers Improper Procedures in Oral Medicine and Surgery

2018

Objectives. The aim of this study was to assess appropriateness of diagnostic exams, treatments, and procedures among Italian dental practitioners.Materials and Methods. A questionnaire with multiple responses on topics of dentistry and oral medicine was administered to a sample of 198 Italian dental practitioners. Information on characteristics of the respondents was also collected. Descriptive statistics and multiple correspondence analysis (MCA) were applied. Data were analyzed using R software (version 3.3.2).Results. The survey respondents included Doctors of Medicine (MD) (54/198 = 27%) with or without specialty in dentistry (33% versus 67%), Doctors of Dental Surgery (DDS) (144/198 =…

Demographic and behavioural profiles of patients with common oral mucosal lesions by a homogeneity analysis

2012

Oral Diseases (2012) 18, 396–401 Objective:  The aim of this study is to assess the main oral mucosal lesions (OMLs) within a hospital base and to provide an anamnestic, diagnostic model based on homogeneity analysis of some variables. Methods:  The demographic and behavioural data (i.e. gender, age, smoking status, alcohol consumption and therapeutic drug usage) of 1753 patients with at least one OML were considered. Multiple correspondence analysis (MCA) and multivariate tests of the simultaneous marginal homogeneity hypothesis (SMH) were used to analyse the evidence of any differences between the demographic and behavioural profiles relating to OMLs diagnoses. Statistical significance of…

Socio-Demographic Vulnerability of Youth

2008

For a kind of inertia effect, the Italian welfare state protects today the old age too intensely while little the new risks associated with other phases of life course. Young Italians seem to suffer the actual changes: “youth remain longer in parental home and postpone the creation of its own independent life to most advanced age”. To understand the vulnerability situation increasingly widespreading among young people, it seems more and more necessary the depth analysis of the reasons and the subjective status of this discomfort that occur through a delay in transition to adulthood. In particular we study the self-perceived vulnerability situation of young Italians in the labor market (both…

Multiple factor analysis: principal component analysis for multitable and multiblock data sets

2013

Sensory evaluation with consumers revisited thanks to Free-Comment

2021

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