94 resultados para Latent factor analysis


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This paper reports on the psychometric properties of the Social Phobic Inventory (SoPhI) a 21-item scale that was designed to measure social anxiety according to the criteria of DSM-IV (American Psychiatric Association, APA (1994) Diagnostic and Statistical Manual of Mental Disorder , 4th Edn., Washington). Factor analysis of the SoPhI using data from a clinical sample of respondents with social phobia revealed one factor which explained approximately 59% of variance and which demonstrated strong internal reliability ( agr= 0.93). The SoPhI demonstrated concurrent validity with the SPAI ( r = 0.86) and convergent validity with the Fear of Negative Evaluations-Revised ( r = 0.68). The predictive utility of the scale was demonstrated in a sample of university students classified as extroverted, normal, shy/introverted, and phobic/withdrawn ( -2 57%). Multivariate Analysis of Variance (MANOVA) revealed that the combined university sample differed from the clinical sample on the summated scores on the SoPhI and that 43% ( -2 ) of this difference was attributable to group membership. This figure rose to 58% attributable to group membership when these same groups were compared for differences on the 21 individual items. Scores of the SoPhI that are indicative of concern and of possible diagnostic criteria, as well as suggestions for future research, are discussed.

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Using a sample of 446 secondary students who had participated in a vocational education and training in school (VETiS) program, compares the experiences and perceptions of students who had undertaken a work placement with those who had not. Shows that students who had participated in work placement enjoyed the VETiS experience more than those who had not, and that the work placement had assisted them in their decision whether to stay at school or not. A factor analysis of results showed a factor associated with self-confidence about employability, and a factor associated with assistance in achieving specific post-school employment. Students who had completed a work placement were significantly higher on both these factors than students who had not. Results are consistent with other research in the field, and it is argued that the work placement experience plays a considerable part in developing student agency in the decisions and the journey that they make in their transition from school to work.

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Using a sample of 314 Australian university students the Readiness for Online Learning questionnaire was tested for its technical characteristics of reliability and factorability, with results indicating the instrument has promise both for research and for practice. The factor analysis identified a factor associated with self-management of learning, and one of comfort with e-learning. These factors are interpreted and discussed within a framework of the broader literature on learning preferences associated with flexible delivery and resource-based learning.

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This study applies the competing values approach (CVA) of organizational effectiveness to a sample of nonprofit Australian national Olympic sporting organizations (NOSOs). The purpose of the study was to determine the psychometric properties of the subscales developed within each of the four quadrants composing the CVA. Two hundred eightynine constituents from 10 NOSOs participated in this study. Initial factor analysis resulted in six of the eight theoretically derived cells in the CVAeach yielding one reliable factor. These were Flexibility, Resources, Planning, Productivity, Availability of Information, and Stability. The other two cells, Skilled Workforce and Cohesive Workforce, each produced a two-factor structure. To understand the relationship between these manifest factors (cells) and organizational effectiveness, a confirmatory factor analysis was conducted, which revealed that the rational-goal model, comprising Productivity and Planning, was the critical determinant of effectiveness in NOSOs.

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This paper reports on a survey of how Australian undergraduate students perceive the benefits of broad study modes: face-to-face classes, web-based study, and print-based study. Two benefit types were identified through factor analysis: engagement and functionality. Respondents rated face-to-face classes highest on engagement and print-based study highest on functionality. However, they distinguished only marginally between the engagement and functionality benefits of print-based and web-based study. Two variables associated with differences in students' perceptions of study modes were attendance mode and student tenure. The findings raise questions about the learning and marketing rationales for offering web-based delivery of educational programmes at the expense of both the traditional face-to-face experience and the traditional “distance” experience in Australia using print materials.

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Objective

To develop and validate the Impact of Multiple Sclerosis Scale (IMSS) and the Symptoms of Multiple Sclerosis Scale (SMSS) using the Extended Disability Status Scale (EDSS) for construct validity.
Design

Panel design involving test-retest over 4 months.
Setting

A mailed survey.
Participants

Volunteers with a diagnosis of multiple sclerosis (MS) recruited from an MS support service in Australia: 193 people (mean age, 39y) and 150 people participated at time 1 and time 2, respectively.
Interventions

Not applicable.
Main Outcome Measures

Principal components analyses, the Cronbach α, and descriptive statistics for the 2 scales; correlations for construct validity with the EDSS and retest; and confirmatory factor analysis to test the stability of IMSS and SMSS components over time.
Results

The IMSS yielded 5 independent and reliable components; the SMSS yielded 3 components; both component structures were stable over time. These scales showed convergent validity with the EDSS.
Conclusions

The IMSS and SMSS are psychometrically sound scales suitable for clinical and research purposes to assess the symptoms and impact of MS.

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Objective: The aim of this study is to evaluate the consistency of dietary patterns assessed through the use of a dietary recall and a 5-day food diary. Design: Participants (n=2265) of a longitudinal study of health and development completed 48-h dietary recall at interview, followed by a 5-day food diary and with the 24 h immediately preceding the interview analysed separately as a 24-h recall. Mean intakes of foods and nutrients were calculated and dietary patterns were assessed using exploratory factor analysis, using the method of principal components. Paired t-tests and correlation coefficients were used to compare the three dietary assessment methods. Results: Five distinct dietary patterns were identified using the food diary and the 48-h recall but were less consistent on the 24-h recall.  Correlations between factor scores on the 48-h recall and the food diary (r=0.13–0.67) were higher than those between the 24-h recall and food diary (r=-0.01–0.59). The recall methods were effective at ranking subjects according to food and nutrient intakes, with the 48-h recall and food diary showing higher correlations in both males and females. Conclusions: This study indicates that a 48-h recall effectively characterises dietary patterns in British adults when compared to a food diary and ranks participants appropriately with respect to most nutrients and foods and is superior to a single 24-h recall. These results have implications for longitudinal studies where maximising response rates to repeat dietary assessment tools is essential.

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Introduction: The Emergency Department (ED) at The Northern Hospital is currently participating in the Victorian Department of Human Services funded Emergency Nurse Practitioner Project. This project aims to develop, implement and evaluate the Emergency Nurse Practitioner role in Victorian EDs. This led to a need to develop a specific data collection tool called The Northern Emergency Nurse Practitioner Staff Survey to examine the knowledge and attitudes of ED medical and nursing staff. This paper describes the development of The Northern Emergency Nurse Practitioner Staff Survey and presents the results of reliability and validity studies. Method: Twenty-five items were developed and piloted on a sample of 58 ED medical and nursing staff. Content and face validity were established by expert panel review. Reliability was established by tests of unidimensionality, exploratory factor analysis and internal consistency. Results: Four items were discarded because of low item to total correlation. Exploratory factor analysis of the remaining items revealed five factors with eigenvalues >1 and acceptable correlation coefficients that explained 76.7% of the variance. Cronbach’s coefficent α for these items was 0.926 indicating a high degree of internal consistency. The factors were titled to reflect the content domain of the items in each factor and the factors arranged in a logical sequence to form the final version of The Northern Emergency Nurse Practitioner Survey.

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Background: The Critical Care Family Needs Inventory (CCFNI) has been used widely over the last two decades for analysing the needs of family members in the intensive care unit. However, it has significant limitations as a needs assessment tool for use with families in the Emergency Department (ED). This paper discusses the methodological challenges encountered during the process of reviewing and adapting this tool for use in the ED. Aims: The purpose of this study was to revise and adapt the CCFNI for use with a population of family members of critically ill patients in an Australian Emergency Department. Instrument: The process of tool revision, adaptation and reconstruction included: critique of the CCFNI; concept definition; item review; content and structure revision; scale revision; and testing with a sample of the target population. Methods: Data collection methods were aimed at accessing a vulnerable population, while enhancing response rate and data quality. A sample of 84 relatives of critically ill patients from one Melbourne Metropolitan Emergency Department was used, 73% of whom returned questionnaires. Results: Pilot data were examined with the specific purpose of identifying elements of the tool that required refinement or modification. Methods used for establishing reliability and validity of the revised tool provided satisfactory results. Limitations: Limitations of this study include inadequate sample size for exploratory factor analysis, and an incomplete response set for some items, which influenced item analysis. Conclusion: The process used for addressing the identified methodological issues in reviewing and adapting the CCFNI for use in the ED provides a framework for adapting an established tool for a specific purpose.

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To date, financial institutions have no recognised publicly available and standard scale to measure the quality of their services (Bahia and Nantel, 2000). Much of the service quality literature has focused on two measures, SERVQUAL and SERVPERF. Although debate continues about the pros and cons of these individual measures, the reality is that neither is industry specific. The BANKSERV instrument was developed to measure service quality in retail banking as perceived by customers. It was designed to allow customers to reflect on their expectations and perceptions in single statements. This paper reports the results of a confirmatory factor analysis conducted to test the fit of the BANKSERV model to data collected using a perceptions-only measure (BANKPERF). Data were collected via questionnaire, with a sample of 348 banking customers being obtained. Findings suggest that the ‘goodness of fit’ of the BANKSERV model to the observed data was ‘marginal’.

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Using a sample of 446 secondary students who had participated in a vocational education and training in school (VETiS) program, this study compares the experiences and perceptions of students who had undertaken a work placement with those who had not. The study shows that students who had participated in work placement enjoyed the VETiS experience more than those who had not, and that the work placement had assisted them in their decision whether to stay at school or not. A factor analysis of results showed a factor associated with self-confidence about employability, and a factor associated with assistance in achieving specific post-school employment. Students who had completed a work placement were significantly higher on both these factors than students who had not.

These results are consistent with other research in the field, and it is argued that the work placement experience plays a considerable part in developing student agency in the decisions and the journey that they make in their transition from school to work.

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Australian universities face a challenging task to service an increasingly diverse international student community in the globally competitive education market. The pressure on universities to successfully negotiate cultural diversity arising from nationality differences and to improve service quality will continue to increase with further expansions in the international student market. Such a scenario requires insights into the individual backgrounds of students. Personal values are one way in which insights can be gained of students, particularly with regard to their needs and preferences. Using Factor Analysis, ANOVA and MANOVA, this study analyses the national differences on the basis of underlying value domains of Selfefficacy, Power, Inner harmony, Aspiration and Hedonism. The results indicate significant differences in personal values amongst the student cohorts, which suggest that universities may need to adopt different approaches in servicing international students.

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Outsourcing of IT is a popular strategy, argued by proponents to deliver a range of benefits including cost savings, increased service quality, and strategic advantages. However, empirical evidence of the success of outsourcing is limited, and several recent studies have suggested widespread dissatisfaction exists amongst purchasers. This paper analyses one such study to determine predictors of outsourcing satisfaction (and
dissatisfaction). The analysis reveals that, for purchasers, IT outsourcing satisfaction and perceived value (which are highly correlated) depend on whether strategic benefits are obtained, and on the technical service quality provided by vendors. Both in turn depend on whether expected cost savings are obtained. The implications of these findings for both vendors and purchasers are discussed.

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Despite the growing interest in dietary patterns, there have been few longitudinal investigations. The objective of the present study was to extend an earlier method of dietary pattern assessment to longitudinal binary data and to assess changes in patterns over time and in relation to socio-demographic covariates. A prospective national cohort of 1265 participants completed a 5 d food diary at three time-points during their adult life (at age 36 years in 1982, 43 years in 1989 and 53 years in 1999). Factor analysis identified three dietary patterns for women (fruit, vegetables and dairy; ethnic foods and alcohol; meat, potatoes and sweet foods) and two patterns in men (ethnic foods and alcohol; mixed). Trends in dietary pattern scores were calculated using random effects models. Marked changes were found in scores for all patterns between 1989 and 1999, with only the meat, potatoes and sweet foods pattern in women recording a decline. In a multiple variable model that included the three time-points, socio-demographic variables and BMI time-dependent covariates, both non-manual social class and higher education level were also strongly associated with the consumption of more items from the ethnic foods and alcohol pattern and the mixed pattern for men (P<0[middle dot]0001) and the fruit, vegetables and dairy pattern and the ethnic foods and alcohol pattern for women (P<0[middle dot]01). In conclusion, longitudinal changes in dietary patterns and across socio-economic groups can assist with targeting public health initiatives by identifying stages during adult life when interventions to improve diet would be most beneficial to health.

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Dietary patterns are important in the prevention of chronic disease; however, there are few studies that include repeat measures of dietary patterns. The objective of this study was to assess the relations between dietary patterns during adult life (at ages 36, 43, and 53 y) and risk factors for chronic disease at age 53 y. Participants of a longitudinal study of health completed a 5-d food diary at 3 occasions during adult life (n = 1265). Factor analysis was used to identify dietary patterns and a pattern score was calculated from the consumption of the food items in each dietary pattern. Means and 95% CI for dietary pattern scores were calculated for each risk factor category using random effects models adjusted for socio-demographic and health-related behaviors. In women, the fruit, vegetables, and dairy pattern was inversely associated with BMI (P < 0.004), waist circumference (P = 0.0007), blood pressure (P = 0.02), and was positively associated with red cell folate (P < 0.03). The ethnic foods and alcohol pattern was also inversely associated with blood pressure (P = 0.008), whereas the meat, potatoes and sweet foods pattern was positively associated with glycated hemoglobin (P = 0.01). In men, a mixed pattern was inversely associated with waist circumference (P = 0.02) and blood pressure (P = 0.01), whereas there were no significant associations with the ethnic foods and alcohol pattern. Specific dietary patterns throughout adult life were associated with chronic disease risk factors.