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Contributo das técnicas de análise fatorial para o estudo do programa "ocupação científica de jovens nas férias"

Portela, Domingas Maria Pina
Fonte: Universidade Aberta de Portugal Publicador: Universidade Aberta de Portugal
Tipo: Dissertação de Mestrado
Publicado em //2012 POR
Relevância na Pesquisa
65.87%
Dissertação de Mestrado em Estatística, Matemática e Computação apresentada à Universidade Aberta; Neste trabalho abordam-se as técnicas de Análise Fatorial Exploratória e de Análise Fatorial Confirmatória, visando a sua aplicação a um questionário administrado a 3519 participantes do Programa “Ocupação Científica de Jovens nas Férias”, ao longo de um período de seis anos (2005-2010). Apresentam-se as formulações teóricas dos modelos, métodos de estimação e de validação dos mesmos. A aplicação destas técnicas revelou a capacidade do questionário para captar uma estrutura fatorial (variáveis latentes ou constructos) subjacente às variáveis que compõem o questionário, num contexto de grande diversidade em termos da oferta de estágios, áreas científicas abrangidas e natureza das instituições de acolhimento. Da análise resultou a identificação de variáveis latentes, cuja estrutura foi verificada pela Análise Fatorial Confirmatória e validada através de outras amostras. Resultou ainda um conjunto de recomendações para uma reformulação do inquérito, de forma a abranger um leque mais alargado de subescalas na avaliação da perceção dos participantes no programa, bem como a sugestão de alargar a escala de Likert utilizada.; A practical application of Exploratory Factor Analysis and Confirmatory Factor Analysis is applied to the answers of a survey of 3519 secondary school students who attended a summer science internships programme promoted by the Portuguese National Agency for Scientific and Technological Culture – Ciência Viva...

Application of exploratory factor analysis to assess fish consumption in a university community

Maciel,Erika da Silva; Savay-da-Silva,Luciana Kimie; Vasconcelos,Júlia Santos; Galvão,Juliana Antunes; Sonati,Jaqueline Girnos; Silva,Dirceu da; Oetterer,Marília
Fonte: Sociedade Brasileira de Ciência e Tecnologia de Alimentos Publicador: Sociedade Brasileira de Ciência e Tecnologia de Alimentos
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2013 EN
Relevância na Pesquisa
95.92%
The objective of this research was to use the technique of Exploratory Factor Analysis (EFA) for the adequacy of a tool for the assessment of fish consumption and the characteristics involved in this process. Data were collected during a campaign to encourage fish consumption in Brazil with the voluntarily participation of members of a university community. An assessment instrument consisting of multiple-choice questions and a five-point Likert scale was designed and used to measure the importance of certain attributes that influence the choice and consumption of fish. This study sample was composed of of 224 individuals, the majority were women (65.6%). With regard to the frequency of fish consumption, 37.67% of the volunteers interviewed said they consume the product two or three times a month, and 29.6% once a week. The Exploratory Factor Analysis (EFA) was used to group the variables; the extraction was made using the principal components and the rotation using the Quartimax method. The results show clusters in two main constructs, quality and consumption with Cronbach Alpha coefficients of 0.75 and 0.69, respectively, indicating good internal consistency.

Cattell’s Personality Factor Questionnaire (CPFQ): Development and Preliminary Study

Primi,Ricardo; Ferreira-Rodrigues,Carla Fernanda; Carvalho,Lucas de Francisco
Fonte: Universidade de São Paulo, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto Publicador: Universidade de São Paulo, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2014 EN
Relevância na Pesquisa
65.85%
This study was aimed at: (a) developing an instrument for personality assessment according to Cattell’s model, in which the 16PF is based on; and (b) carrying out an empirical analysis of the internal structure of the instrument. Three hundred and forty seven people, mostly female (67.4%), attending higher education (62.5%) and aged between 16 and 66 (M = 25.69; SD = 8.90) participated in the study. One hundred and twenty items were created and an exploratory factor analysis of the main factors was carried out. Then, a parallel analysis, an exploratory full information factor analysis with categorical variables and an internal consistency analysis were performed. The results suggest that the instrument is composed of 12 factors of reasonable internal consistency rates. The model developed by Cattell helped to understand the structural organization found for the instrument, since there is coherency, especially in relation to more general terms (global factors).

Exploratory factor analysis of the brazilian version of the Post-Traumatic Stress Disorder Checklist: civilian version (PCL-C)

Passos,Roberta Benitez Freitas; Figueira,Ivan; Mendlowicz,Mauro Vítor; Moraes,Claudia Leite; Coutinho,Evandro Silva Freire
Fonte: Associação Brasileira de Psiquiatria - ABP Publicador: Associação Brasileira de Psiquiatria - ABP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2012 EN
Relevância na Pesquisa
85.85%
OBJECTIVE: To evaluate the factor structure of the Brazilian Portuguese version of the Post-Traumatic Stress Disorder Checklist - civilian version (PCL-C), in order to complement its validation process in Brazil. METHOD: An exploratory factor analysis with promax rotation was conducted in 175 ambulance workers of the Emergence Rescue Group (GSE from Portuguese) of the Rio de Janeiro fire brigade and 343 military police officers (MP) (150 from an elite unit of the state of Goiás). RESULTS The results revealed a two-factor solution: re-experience/avoidance, numbing/hyperarousal. All variables loaded highly in at least one factor, except for one; variable 16. This item may have had a bad performance because the analysis was based on a sample of police officers, whose professional activity demands hypervigilance as one of its basic characteristics. Internal consistency values were acceptable. CONCLUSIONS: Avoidance and numbing seem to be independent dimensions, differently from what is expected according to the DSM-IV. Therefore, new trials should be carried out in other populations, with victims of different kinds of trauma, and including females, to verify these findings.

The time has come to stop rotations for the identification of structures in the Hamilton Depression Scale (HAM-D17)

Bech,Per; Csillag,Claudio; Hellström,Lone; Fleck,Marcelo Pio de Almeida
Fonte: Associação Brasileira de Psiquiatria - ABP Publicador: Associação Brasileira de Psiquiatria - ABP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2013 EN
Relevância na Pesquisa
65.93%
Objective: To use principal component analysis (PCA) to test the hypothesis that the items of the Hamilton Depression Scale (HAM-D17) have been selected to reflect depression disability, whereas some of the items are specific for sub-typing depression into typical vs. atypical depression. Method: Our previous study using exploratory factor analysis on HAM-D17 has been re-analyzed with PCA and the results have been compared to a dataset from another randomized prospective study. Results: PCA showed that the first principal component was a general factor covering depression disability with factor loadings very similar to those obtained in the STAR*D study. The second principal component was a bi-directional factor contrasting typical vs. atypical depression symptoms. Varimax rotation gave no new insight into the factor structure of HAM-D17. Conclusion: With scales like the HAM-D17, it is very important to make a proper clinical interpretation of the PCA before attempting any form of exploratory factor analysis. For the HAM-D17, our results indicate that profile scores are needed because the total score of all 17 items in the HAM-D17 does not give sufficient information.

Factor structure, internal consistency and reliability of the Posttraumatic Stress Disorder Checklist (PCL): an exploratory study

Lima,Eduardo de Paula; Barreto,Sandhi Maria; Assunção,Ada Ávila
Fonte: Associação de Psiquiatria do Rio Grande do Sul Publicador: Associação de Psiquiatria do Rio Grande do Sul
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2012 EN
Relevância na Pesquisa
65.85%
INTRODUCTION: Posttraumatic stress disorder (PTSD) is an anxiety disorder resulting from exposure to traumatic events. The Posttraumatic Stress Disorder Checklist (PCL) is a self-report measure largely used to evaluate the presence of PTSD. OBJECTIVE: To investigate the internal consistency, temporal reliability and factor validity of the Portuguese language version of the PCL used in Brazil. METHODS: A total of 186 participants were recruited. The sample was heterogeneous with regard to occupation, sociodemographic data, mental health history, and exposure to traumatic events. Subjects answered the PCL at two occasions within a 15 days’ interval (range: 5-15 days). RESULTS: Cronbach’s alpha coefficients indicated high internal consistency for the total scale (0.91) and for the theoretical dimensions of the Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) (0.83, 0.81, and 0.80). Temporal reliability (test-retest) was high and consistent for different cutoffs. Maximum likelihood exploratory factor analysis (EFA) was conducted and oblique rotation (Promax) was applied. The Kaiser-Meyer-Olkin (KMO) index (0.911) and Bartlett’s test of sphericity (χ² = 1,381.34, p < 0.001) indicated that correlation matrices were suitable for factor analysis. The analysis yielded three symptom clusters which accounted for 48.9% of the variance...

Mismatch of Posttraumatic Stress Disorder (PTSD) Symptoms and DSM-IV Symptom Clusters in a Cancer Sample: Exploratory Factor Analysis of the PTSD Checklist-Civilian Version

Shelby, Rebecca A.; Golden-Kreutz, Deanna M.; Andersen, Barbara L.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /08/2005 EN
Relevância na Pesquisa
65.83%
The Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV; American Psychiatric Association, 1994a) conceptualization of posttraumatic stress disorder (PTSD) includes three symptom clusters: reexperiencing, avoidance/numbing, and arousal. The PTSD Checklist-Civilian Version (PCL-C) corresponds to the DSM-IV PTSD symptoms. In the current study, we conducted exploratory factor analysis (EFA) of the PCL-C with two aims: (a) to examine whether the PCL-C evidenced the three-factor solution implied by the DSM-IV symptom clusters, and (b) to identify a factor solution for the PCL-C in a cancer sample. Women (N = 148) with Stage II or III breast cancer completed the PCL-C after completion of cancer treatment. We extracted two-, three-, four-, and five-factor solutions using EFA. Our data did not support the DSM-IV PTSD symptom clusters. Instead, EFA identified a four-factor solution including reexperiencing, avoidance, numbing, and arousal factors. Four symptom items, which may be confounded with illness and cancer treatment-related symptoms, exhibited poor factor loadings. Using these symptom items in cancer samples may lead to overdiagnosis of PTSD and inflated rates of PTSD symptoms.

Brooding and Pondering: Isolating the active ingredients of depressive rumination with exploratory factor analysis and structural equation modeling

Armey, Michael F.; Fresco, David M.; Moore, Michael T.; Mennin, Douglas S.; Turk, Cynthia L.; Heimberg, Richard G.; Spasojevic, Jelena; Alloy, Lauren B.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
65.8%
Depressive rumination, as assessed by Nolen-Hoeksema’s Response Styles Questionnaire (RSQ; Nolen-Hoeksema & Morrow, 1991), predicts the onset, chronicity, and duration of depressed mood. However, some RSQ items contain depressive content and result in a heterogeneous factor structure. After the a priori elimination of items potentially confounded with depressed item content, Treynor et al. (2003) identified two factors within the remaining RSQ rumination subscale that were differentially related to depression: brooding and pondering. However, Treynor et al. (2003) used a non-standard form and administration of the RSQ. The present study sought to address these methodological idiosyncrasies and replicate the factor structure of Treynor et al. (2003) through exploratory factor analysis and structural equation modeling. Findings support the brooding and pondering solution and demonstrate that brooding relates more strongly to depression and anxiety than does pondering.

Lower genital tract inflammatory milieu and the risk of subsequent preterm birth: an exploratory factor analysis

Simhan, Hyagriv N.; Bodnar, Lisa M.; Kim, Kevin H.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
65.86%
The inflammatory milieu of the cervix may play a role in preventing intrauterine infection and subsequent preterm birth. The objectives of this study were to use exploratory factor analysis to discover the underlying structure of cytokines in the lower genital tract immunologic milieu, and evaluate the association between the cytokine factors and risk of preterm birth. Women (n=613) enrolled in a prospective pregnancy cohort study in Pittsburgh, Pennsylvania had cervical cytokine concentrations assayed at <16 weeks and were followed for data on pregnancy outcomes. Principal factor analysis identified 2 primary cytokine patterns at <16 weeks gestation: Factor 1 (proinflammatory / immunomodulatory factor), which loaded highly on interleukin (IL)-1β, IL-6, IL-8, monocyte chemotactic protein-1, and IL-10, and Factor 2 (anti-inflammatory factor), which loaded heavily on IL-4, IL-10, and IL-13. Women in the highest tertile of anti-inflammatory cytokine factor scores at <16 weeks had an increased risk of spontaneous preterm birth (confounder-adjusted odds ratio (95% CI): 2.4 (1.1, 5.7)). There was no association between pro-inflammatory cytokine factor scores and preterm birth risk. These data support the hypothesis that increased concentrations of anti-inflammatory cytokines may represent a cervical immune milieu that permits subsequent microbial invasion of the uterus during pregnancy...

The Application of an Exploratory Factor Analysis to Investigate the Inter-Relationships amongst Joint Movement During Performance of a Football Skill

Smith, Christina; Gilleard, Wendy; Hammond, John; Brooks, Lyndon
Fonte: Asist Group Publicador: Asist Group
Tipo: Artigo de Revista Científica
Publicado em 15/12/2006 EN
Relevância na Pesquisa
65.89%
Many studies have investigated the kinematics of sports skills with the majority describing the kinematics of the technique or investigating significant kinematic variables that affect performance. Many sports skills are complex three-dimensional movements involving many joints. However, few studies have investigated the relationships between kinematic variables during performance of such skills. The aim of this study was to investigate the inter- relationships among three-dimensional kinematic variables during performance of a lofted instep soccer kick. A motion analysis system was used to collect kinematic data for 13 skilled amateur soccer players attempting a standardised lofted instep kick. Three-dimensional angular displacement patterns were reported for the thoracolumbar spine and right hip joints. Two-dimensional angular displacement data was reported for the right knee and ankle joints. An exploratory rather than confirmatory factor analysis was applied, as there is currently no established theory regarding the kinematics of a lofted instep kick. Factors were extracted using the Maximum Likelihood Solution and orthogonally rotated using Varimax with Kaiser normalisation. The inter-relationship among biomechanical variables within the seven extracted factors was analysed with each factor revealing previously unknown inter-relationships among variables for different aspects of the kick. The use of exploratory factor analysis has shown the complex three-dimensional kinematic inter-relationships for a lofted instep kick. An understanding of these relationships could prove useful to coaches when instructing...

Measurement of Mealtime Behaviors in Rural Overweight Children: An Exploratory Factor Analysis of the Behavioral Pediatrics Feeding Assessment Scale

Davis, Ann M.; Canter, Kimberly S.; Stough, Cathleen Odar; Gillette, Meredith Dreyer; Patton, Susana
Fonte: Oxford University Press Publicador: Oxford University Press
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
65.81%
Objective The current study presents results of an exploratory factor analysis (EFA) of the Behavioral Pediatric Feeding Assessment Scale (BPFAS) in a sample of rural children with overweight and obesity. Relationships between mealtime behavior and health outcomes are also explored. Methods EFA was used to assess the fit of the BPFAS in a group of 160 treatment-seeking children (Mage = 9.11, SD = 1.77) living in rural Midwest communities. Correlations were also computed between factor scores and select health variables (child body mass index z-score and diet variables). Results The EFA identified a 5-factor solution as the best fitting model (Tucker–Lewis Index = .96, root mean square error of approximation = .05), although several items (i.e., 7 of 25) did not load on any factor. 2 factors were correlated with health variables of interest. Conclusion Study results suggest that certain items on the BPFAS may not be appropriate for use with rural children with pediatric overweight or obesity. Implications for future research and practice are discussed.

Why start a higher degree by research? An exploratory factor analysis of motivations to undertake doctoral studies

Guerin, C.; Jayatilaka, A.; Ranasinghe, D.
Fonte: Routledge Publicador: Routledge
Tipo: Artigo de Revista Científica
Publicado em //2015 EN
Relevância na Pesquisa
75.69%
Despite the increasing numbers of candidates embarking on higher degrees by research (HDRs, e.g., PhD, professional doctorate, practice-based doctorate), we still have limited knowledge about why they are choosing this path. What are the factors that motivate students to embark on research degrees? Given that many of those who succeed in completing their doctorates will not go into academic positions, the motivations for choosing to undertake a research degree may not match the experience or outcomes (and hence, perhaps, contribute to incompletion rates). This article investigates the motivations of students in all faculties embarking on HDRs at an Australian university. A survey of 405 students was subjected to a factor analysis. Five factors emerged: family and friends, intrinsic motivation, lecturer influence, research experience, and career progression.; Cally Guerin, Asangi Jayatilaka, Damith Ranasingh

Validación del constructo subyacente en una escala de evaluación del impacto de la investigación educativa sobre la práctica docente mediante análisis factorial confirmatorio; Validation of the underlying construct in a rating scale to assess the impact of educational research on teaching practice using confirmatory factor analysis

Díaz Costa, Elisabet; Fernández-Cano, Antonio; Faouzi, Tarik; Henríquez, Carlos Felipe
Fonte: Universidade de Múrcia Publicador: Universidade de Múrcia
Tipo: Artigo de Revista Científica Formato: application/pdf
SPA
Relevância na Pesquisa
85.86%
This article examines the validation stages of a rating scale to assess the impact of educational research on teaching practice, paying particular attention to the procedures to validate the underlying construct. To achieve this aim, we considered the research problem, sample availability, and criteria of scientific rigor for developing survey instruments, specifically a rating scale. Data drawn from a rating scale are applied to a sample of 62 teachers at the University of Granada (Spain) and 117 non-university teachers. Through a secondary analysis of the data, the different stages to validate the construct were developed, obtaining three constructs comprising 16 items of the 43 items available. The study shows that confirmatory factor analysis is more powerful than exploratory factor analysis in validating the underlying construct of a measurement instrument (rating scale) and in reducing the scale items.; Este artículo muestra las etapas de validación de una escala de evaluación del impacto de la investigación educativa en la práctica docente, enfatizando los procedimientos de validez del constructo subyacente. Para ello, se tuvieron en consideración el problema a investigar y los criterios de rigor científico propios de la construcción de instrumentos de encuesta...

Validation of a CRM scale for the B2C market: exploratory factor analysis

Demo, Gisela
Fonte: Brazilian Association for Industrial Engineering and Operations Management (ABEPRO) Publicador: Brazilian Association for Industrial Engineering and Operations Management (ABEPRO)
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Peer-reviewed Article; Formato: application/pdf
Publicado em 05/01/2014 ENG
Relevância na Pesquisa
75.8%
The main objective of this study was to develop and validate in the United States a reliable and valid scale for Customer Relationship Management (CRM) in the business-to-consumer (B2C). An American sample (N=210) was collected online using MTurk in order to ensure the presence of a broad variety of American customers. The result was a one-factor model with high reliability and good fit. This research is a starting point to provide a comprehensive valid measure of customer relationship management based on customers’ perspectives. As practical implications, the one-factor model can be used as a diagnostic tool to identify aspects in CRM where specific improvements are needed. Also, it can be used as an instrument of evaluation to help managers better understand how to meet client’s needs in order to deliver high-value products and services developing a long-term and profitablerelationship.

Exploratory factor analysis in validation studies: uses and recommendations

Izquierdo Alfaro, Isabel; Olea Díaz, Julio; Abad, Francisco José
Fonte: Colegio Oficial de Psicólogos del Principado de Asturias; Publicador: Colegio Oficial de Psicólogos del Principado de Asturias;
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
65.86%
Los artículos indexados deberán ser referenciados de forma completa, dejando patente que han sido publicados previamente en la revista Psicothema, indicando los autores, título del manuscrito, volumen, número, año y páginas; The Exploratory Factor Analysis (EFA) procedure is one of the most commonly used in social and behavioral sciences. However, it'is also one of the most criticized due to the poor management researchers usually display. The main goal is to examine the relationship between practices usually considered more appropriate and actual decisions made by researchers. Method: The use of exploratory factor analysis is examined in 117 papers published between 2011 and 2012 in 3 Spanish psychological journals with the highest impact within the previous five years. Results: Results show significant rates of questionable decisions in conducting EFA, based on unjustified or mistaken decisions regarding the method of extraction, retention, and rotation of factors. Conclusions: Overall, the current review provides support for some improvement guidelines regarding how to apply and report an EFA.; El análisis factorial exploratorio en estudios de validación: usos y recomendaciones. Antecedentes: la técnica del Análisis Factorial Exploratorio (AFE) es una de las más utilizadas en el ámbito de las Ciencias Sociales y del Comportamiento; no obstante...

A statistical approach to quantitative data validation focused on the assessment of students' perceptions about biotechnology

Fonseca, Maria João; Costa, Patrício Soares; Lencastre, Leonor; Tavares, Fernando
Fonte: Springer Publicador: Springer
Tipo: Artigo de Revista Científica
Publicado em //2013 POR
Relevância na Pesquisa
65.79%
Student awareness levels are frequently used to evaluate the effectiveness of educational policies to promote scientific literacy. Over the last years several studies have been developed to assess students' perceptions towards science and technology, which usually rely on quantitative methods to achieve broad characterizations, and obtain quantifiable and comparable data. Although the usefulness of this information depends on its validity and reliability, validation is frequently neglected by researchers with limited background in statistics. In this context, we propose a guideline to implement a statistical approach to questionnaire validation, combining exploratory factor analysis and reliability analysis. The work focuses on the psychometric analysis of data provided by a questionnaire assessing 1196 elementary and high school students' perceptions about biotechnology. Procedural guidelines to enhance the efficiency of quantitative inquiry surveys are given, by discussing essential methodological aspects and relevant criteria to integrate theory into practice.

Human resources management policies and practices scale (HRMPPS): exploratory and confirmatory factor analysis

Demo,Gisela; Neiva,Elaine Rabelo; Nunes,Iara; Rozzett,Kesia
Fonte: ANPAD - Associação Nacional de Pós-Graduação e Pesquisa em Administração Publicador: ANPAD - Associação Nacional de Pós-Graduação e Pesquisa em Administração
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2012 EN
Relevância na Pesquisa
75.91%
Given the strategic relevance of Human Resources Management (HRM) in organizations and the lack of scientific instruments to measure employees' perceptions about policies and practices of HRM, this study aimed to validate the Human Resources Management Policies and Practices Scale (HRMPPS) through exploratory and confirmatory factor analysis using the maximum likelihood method. The study has a quantitative design, but also included qualitative analysis required for the development of a scale. Employees from various organizations composed a sample of 632 people. Scale reliability was assessed by Cronbach's alpha and Jöreskog's rho. A six-factor model was generated showing high-reliability and good fit. Construct validity was provided through convergent and discriminant analyses. The factors were consistent with the literature review and explained about 58% of the construct's total variance. This study contributes to the scientific production in the area of Human Resources Management since HRMPPS can be used not only in relational studies but also as an evaluation instrument by managers who wish to improve their employees' well-being as well as organizational outcomes.

Empirically derived dietary patterns: interpretability and construct validity according to different factor rotation methods

Castro,Michelle Alessandra de; Baltar,Valéria Troncoso; Selem,Soraya Sant'Ana de Castro; Marchioni,Dirce Maria Lobo; Fisberg,Regina Mara
Fonte: Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz Publicador: Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2015 EN
Relevância na Pesquisa
65.87%
This study aimed to investigate the effects of factor rotation methods on interpretability and construct validity of dietary patterns derived in a representative sample of 1,102 Brazilian adults. Dietary patterns were derived from exploratory factor analysis. Orthogonal (varimax) and oblique rotations (promax, direct oblimin) were applied. Confirmatory factor analysis assessed construct validity of the dietary patterns derived according to two factor loading cut-offs (≥ |0.20| and ≥ |0.25|). Goodness-of-fit indexes assessed the model fit. Differences in composition and in interpretability of the first pattern were observed between varimax and promax/oblimin at cut-off ≥ |0.20|. At cut-off ≥ |0.25|, these differences were no longer observed. None of the patterns derived at cut-off ≥ |0.20| showed acceptable model fit. At cut-off ≥ |0.25|, the promax rotation produced the best model fit. The effects of factor rotation on dietary patterns differed according to the factor loading cut-off used in exploratory factor analysis.

Local rank analysis for exploratory spectroscopic image analysis. Fixed Size Image Window-Evolving Factor Analysis

Juan, Anna de; Maeder, Marcel; Hancewicz, Thomas; Tauler Ferré, Romà
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 22195 bytes; application/pdf
ENG
Relevância na Pesquisa
65.97%
11 pages, 8 figures.-- Printed version published May 28, 2005.-- Issue title: "Festschrift honouring professor D.L. Massart" (Edited by P. Hopke and C. Spiegelman).; Many pharmaceutical and consumer products are composed of emulsion-based formulations that act as delivery systems for active ingredients or other benefit agents. The efficacy and performance of these products often rely on how the actives interact and are stabilized by the base emulsion formulation. It is therefore of great significance to the development and processing of these formulations to be able to accurately characterize the structure and chemical distribution of components in these systems. Recent advances in spectroscopic imaging technology have played an important role in bringing these methods into acceptance and perhaps even prominence in both the consumer product and pharmaceutical industries as standard methods of analyzing these kinds of chemical systems. Concurrently, this has kindled the interest in methodology capable of analyzing the large data sets generated by these multivariate imaging experiments.; Efficient exploratory analysis of spectroscopic images is therefore crucial, the desired goal being to resolve the chemical information in the data into its pure component parts. An approximate description of the compositional complexity of images is not yet available through the usual exploratory procedures.; Methods used for this purpose should be local and be able to take into account the complex spatial structure of the image. Fixed Size Moving Window-Evolving Factor Analysis has been a powerful approach to locally define the complexity of a process through the subsequent PCA analyses of data subsets built by moving a fixed size window along a unique process direction (e.g....

Passionate workers: a Spanish adaptation of the Passion Scale

Orgambídez-Ramos,Alejandro; Borrego-Alés,Yolanda; Gonçalves,Gabriela
Fonte: Revista de Psicología del Trabajo y de las Organizaciones Publicador: Revista de Psicología del Trabajo y de las Organizaciones
Tipo: info:eu-repo/semantics/article; journal article; info:eu-repo/semantics/publishedVersion Formato: text/html; application/pdf
Publicado em 01/08/2014 ENG
Relevância na Pesquisa
65.8%
Passion is defined as a strong inclination toward an activity the people like, that they find important, and in which they invest time and energy, like working. The aim of this study is to present evidence of the validity of the factor structure of the Spanish version of the Passion Scale. Exploratory factor analysis was carried out in a heterogeneous sample of 432 Spanish workers. The results confirmed the expected two-factor structure of passion in the workplace: obsessive passion and harmonious passion. A strong and positive correlation between harmonious passion and job satisfaction was observed, which is considered as an indicator of the positive nature of passion. Future research should investigate more extensively its construct validity with other organizational variables.