152 resultados para Structural equation modelling


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Objective:
On-going evidence is required to support the validity of inferences about change and group differences in the
evaluation of health programs, particularly when self-report scales requiring substantial subjectivity in response generation are used as outcome measures. Following this reasoning, the aim of this study was to replicate the factor structure and investigate the measurement invariance of the latest version of the Health Education Impact Questionnaire, a widely used health program evaluation measure.
Methods:
An archived dataset of responses to the most recent version of the English-language Health Education Impact
Questionnaire that uses four rather than six response options (N=3221) was analysed using exploratory structural equation
modelling and confirmatory factor analysis appropriate for ordered categorical data. Metric and scalar invariance were
studied following recent recommendations in the literature to apply fully invariant unconditional models with minimum
constraints necessary for model identification.
Results:
The original eight-factor structure was replicated and all but one of the scales (Self Monitoring and Insight) was
found to consist of unifactorial items with reliability of ⩾0.8 and satisfactory discriminant validity. Configural, metric and scalar
invariance were established across pre-test to post-test and population sub-groups (sex, age, education, ethnic background).
Conclusion:
The results support the high level of interest in the Health Education Impact Questionnaire, particularly for use as a pre-test/post-test measure in experimental studies, other pre–post evaluation designs and system-level monitoring and evaluation.

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This study focuses on the antecedents of brand credibility and validates part of the model presented by Erdem and Swait (1998). Following the signalling literature, we argue that under asymmetrical information, the importance of brand credibility stems from the capability of brands to inform consumers who are uncertain about product attributes. Indeed, firms may use brands to notify consumers about product positions and to assure that their product claims are credible. Using information economics as theoretical background, the proposed perspective determines how credibility is shaped. Data was collected across a number of consumers in Australia via a self-report survey and a structural equation model (SEM) was estimated. The results provide empirical evidence and support the work of Erdem and Swait (1998).

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This paper develops a conceptual model of the relationship between different cultural values and how they influence consumer satisfaction in the tourism industry. It is hypothesized that cultural differences manifest themselves in different levels of importance being placed upon different aspects of service, and the differences between the levels of importance and the actual service received cause differences in the levels of satisfaction. These hypotheses are tested using 269 independent samples of levels of importance and 411 independent samples of satisfaction of tourists from four cultural groups (Australian, USA/Canadian, Japanese, Mandarin speakers) who visited Melbourne, Australia in the period May-September, 1996. The analysis develops dimensions of importance and satisfaction separately for each cultural grouping, and uses structural equation modeling (Amos 3.6) to develop the causal model measuring the way in which importance of service dimensions cause dimensions of satisfaction. Conclusions from the analysis show little evidence of a causal relationship between importance of service quality attributes and satisfaction. However, significant differences are found between cultures for different levels of satisfaction resulting indirectly from differences in the importance and actual levels of service received.

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The affective content of Subjective Wellbeing (SWB) was investigated in two separate studies. Study 1 involved a representative sample of 478 participants from across Australia aged between 18 and 72 years. This study tested the circumplex model of affect and then determined the minimum set of affects that explain variance in SWB. The model was supported, with most affects congregated around the valence axis. Overall, 64% of the variance in SWB was explained by six Core Affects, indicating that SWB is a highly affective construct. Study 2 tested the relative strength of Core Affect (content, happy and excited), in three separate models of SWB incorporating cognition (seven discrepancies)
and all five factors of personality. Using a sample of 854 participants aged been 18 – 86 years, structural equation modeling was used to compare an affective-cognitive driven model of SWB, with a personality driven model of SWB and a discrepancy driven model of SWB. The results provide support for an affective-cognitive model which explained 90 percent of the variance in SWB. All models confirm that the relationship between SWB, Core Affect and Discrepancies is far stronger than the relationship between personality and SWB. It is proposed that Core Affect and Discrepancies comprise the essence of SWB. Moreover, Core Affect is the driving force behind individual set-point levels in SWB homeostasis.

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Workplace injuries are common and destructive to persons, organisations, and society. Various instruments presently exist that are designed to assess the factors underlying workplace injury. The study reports on the construct and predictive validity of a 46-item instrument, the safety perception survey (SPS), currently used to assess safety climate in industrial organisations throughout Australia. Initially, factor analysis was conducted on the data from a sample of 1238 employees from nine organisations, which indicated a one-factor solution, was the best fit. A structural equation model (SEM) linking injury rates to the safety climate measure for 16 sub-groups of six industrial organisations indicated that the measure contributed just 23% of the variance in injury rates. Interestingly, the results indicated that the number of employees was a better and more significant predictor of injury (R2 = 0.48). It is proposed that the SPS as is would need to be modified significantly from its current form to produce improvements in validity, as in its current form the survey is no more predictive of injury than organisational size. Future research into safety climate measures should incorporate predictive validity analysis on injury rates, as for many organisations; this is a performance outcome measure.

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Research findings support the idea that workload is a significant stressor associated with a variety of deleterious psychological reactions, including burnout, in several different samples of workers. A theoretical model is put forth in the present study in which workload is seen as contributing to distress and depression. Increasingly, organisations are experiencing changes as a result of extensive downsizing, restructuring, and merging. As a result of fiscal restraint, hospitals have been forced to merge, close, downsize, and restructure. Workloads have increased among hospital staff, particularly nurses. This study applies a theoretical model to the understanding of the impact of workload on nurses employed in hospitals experiencing downsizing, particularly on their distress, burnout, and depression. Respondents were 488 nurses who were employed in hospitals that were undergoing restructuring and in which units had already been closed as a result of restructuring. Results of structural equation modeling showed that the data partially fit the model and that workload contributed substantially to levels of depression through distress reactions. Further results showed that cynicism, anger, and emotional exhaustion significantly operationalised distress reactions. This study is unique theoretically in linking anger, cynicism, and emotional exhaustion in a single model that predicts distress levels from workload. The findings that anger, cynicism, and emotional exhaustion operationalised distress indicate the importance of studying patterns of negative reactions and their consequences for depression. Implications of the results are discussed for interventions that can be taken by organisations in order to reduce workloads.

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There is a need for more effective and efficient social behavioural change programs instigated by public sector environmental management organisations. The concepts of intrinsic motivation and extrinsic motivation have been shown to provide insights into the environmental behaviour of various groups. The aim of the paper is to investigate the relationship between Intrinsic Motivation, Extrinsic Motivation and Government influence. In particular this study examines the inter-relationship between intrinsic and extrinsic motivation in environmental management. A random sample of 566 land managers in South-eastern Australia was obtained. A structural equation model was used to develop a model which identities the relationship between intrinsic motivation, extrinsic motivation and government influence.

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This study examines the impact of the scope of risk management and ethical environment on internal audit activities and the quality of accounting control procedures (ACPQ). The conceptual framework for the study is guided by COSO’s frameworks on internal controls and enterprise risk management and data from a questionnaire survey of 64 Australian firms are analysed using a structural equation model. The results of the study support that (1) internal audit activities have a significant intervening effect on the relationship between the scope of risk management and ACPQ, and (2) a direct and positive relationship exists between ethical environment and ACPQ. Our findings suggest that widening the scope of risk management activities do not directly improve ACPQ, but that it leads to more extensive internal audit activities and in turn such activities promote better ACPQ. Further, the results indicate that fostering a more ethical environment directly leads to higher ACPQ. These results have implications for the design of internal controls, namely with respect to the role of internal audit activities and ethical environment in enhancing ACPQ.

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This paper explores the critical success factors of special events, in this case the Anzac Day commemorations at Gallipoli, Turkey. This event has become increasingly popular in recent years with crowd numbers growing to around 20,000 people traveling to attend the 2005 Dawn Service at historic Anzac Cove on Anzac day. The aim of this research is to investigate the success factors associated with Anzac Day commemorations at Gallipoli and to assess how these influence visitor satisfaction. Data was collected from 331 attendees of Anzac Day commemorations at Gallipoli while they were in transit from Gallipoli to Istanbul on 25 April 2007. The analysis of this data was undertaken using exploratory and confirmatory factor analysis as a basis to the development of a model of satisfaction using structural equation modeling. In this case constructs relating to amenities, transport, ceremonies and recommending behavior were found to be significant predictors of event satisfaction. These issues during the event were found to be of equal importance for both genders and all age groups.

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Objective: This paper describes the development and validation of the Health Education Impact Questionnaire (heiQ). The aim was to develop a user-friendly, relevant, and psychometrically sound instrument for the comprehensive evaluation of patient education programs, which can be applied across a broad range of chronic conditions.

Methods:
Item development for the heiQ was guided by a Program Logic Model, Concept Mapping, interviews with stakeholders and psychometric analyses. Construction (N = 591) and confirmatory (N = 598) samples were drawn from consumers of patient education programs and hospital outpatients. The properties of the heiQ were investigated using item response theory and structural equation modeling.

Results: Over 90 candidate items were generated, with 42 items selected for inclusion in the final scale. Eight independent dimensions were derived: Positive and Active Engagement in Life (five items, Cronbach's alpha (α) = 0.86); Health Directed Behavior (four items, α = 0.80); Skill and Technique Acquisition (five items, α = 0.81); Constructive Attitudes and Approaches (five items, α = 0.81); Self-Monitoring and Insight (seven items, α = 0.70); Health Service Navigation (five items, α = 0.82); Social Integration and Support (five items, α = 0.86); and Emotional Wellbeing (six items, α = 0.89).

Conclusion:
The heiQ has high construct validity and is a reliable measure of a broad range of patient education program benefits.

Practice Implications:
The heiQ will provide valuable information to clinicians, researchers, policymakers and other stakeholders about the value of patient education programs in chronic disease management.

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This study used the four factor model of organizational justice to investigate gender differences in the employee outcome cognitive variables of job satisfaction,commitment and turnover intentions. Survey respondents were 301 male and 147 female currently working employees in a variety of occupations. Structural equation modeling was used for the analyses. There were significant relationships from distributive justice to job satisfaction and commitment for both men and women. Informational justice significantly predicted job satisfaction. For women, informational justice predicted commitment and turnover intentions. Procedural justice predicted turnover intentions and interpersonal justice predicted commitment for men. Gender differences were found for procedural, interpersonal and informational justices. Men and women gave differing responses to justice perceptions, implying consideration of a range of views when allocation decisions are made and communicated. For both genders, distributive and informational justices play a central role in predicting employee outcomes, although the other justice types also have an effect for males. Justice had a diffuse effect for males, but not females.

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This paper critically examines an analytical tool - partial least squares regression, or P LS - that is increasingly being used in the academic business literature to validate measures of psychological constructs, and to test hypotheses based on these. The paper provides a contextual and historical review of the resurgence of P LS, and explores several of the claims made by its developers and supporters when it was first promoted in the 1980s, and, more recently, when it reappeared in the information systems literature. Many claims appear plausible but rest on non-mainstream uses of terms and concepts taken from the psychometric field. The paper also canvasses why P LS is a poor analytical tool for research that involves psychological constructs.

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Cognitive theories of depression include maladaptive thinking styles as depressive vulnerabilities. The hopelessness theory of depression (Abramson, Metalsky, & Alloy, 1989) particularly implicates stable and global attributions for negative events as influences upon depression. Positive event attributions are considered less influential, yet they have shown equal predictiveness to negative event attributions for depression-specific mood. Previous research has provided equivocal results largely because of cross-sectional design and modest psychometric properties of the measures. The present research aimed to: create a new instrument to measure optimistic and pessimistic attributions; test the relatedness of attributions for positive and negative events; and, clarify relationships of the scales with optimism and mood. Three studies were undertaken, all of which used structural equation modeling. Two cross-sectional studies, using 342 and 332 community participants respectively, developed and validated the Questionnaire of Explanatory Style (QES). A final longitudinal study with 250 community participants tested the predictive validity of the QES. Overall, six scales were developed, three of which were optimistic and three of which were negative. The scales were acceptable to community samples and had adequate psychometric properties. The optimistic scales were attributions for positive events and the negative scales were attributions for negative events rather than pessimistic scales. Cross-sectional results indicated that only one of the negative scales weakly directly predicted depression-specific mood, but all predicted general psychological distress. By contrast, the optimistic scales were more directly predictive of depression-specific mood, particularly the Positive Disposition scale. Longitudinal results indicated that two of the optimistic scales were the most important QES predictors of depression-specific mood two months later. The optimistic scale Positive Disposition appears most central to the prediction of both concurrent and subsequent depression-specific mood. The scale content represents explanations for positive events that are internal and stable characteristics. These may be construed as personal competencies to bring about positive outcomes. This scale is closely allied to measures of optimism. Findings affirm the importance of optimistic attributions to the understanding of depression-specific mood and provide a productive focus for therapeutic intervention and future research.

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This research developed two best-fitting structural equation models of risk factors for adolescent depression and suicidality: a core model, which included parenting factors, gender, depression, and suicidality, and an extended model, which also encompassed personality traits (Introversion and Impulsivity) and mood factors (Anxiety and Anger). Further, this research investigated the consistency of model fit across time (Le., 1 month & 12 months) and samples, and explored the effectiveness of the ReachOut! Internet site as a psychoeducational prevention strategy for adolescent depression and suicidality. Gender, age, and location differences were also explored. Participants were 185 Year-9 students and 93 Year-10 students aged 14 - 16 years, from seven secondary schools in regional and rural Victoria. Students were given a survey which included the Parental Bonding Instrument (Parker, Tupling, & Brown, 1979), the Millon Adolescent Personality Inventory (Millon, Green, & Meagher, 1982), the Profile of Mood States Inventory (McNair & Lorr, 1964), items on suicidal behaviour including some questions from the Revised Adolescent Suicide Questionnaire (Pearce & Martin, 1994), and questions on loss and general demographics. Results supported an indirect model of risk factors, with family factors directly influencing personality factors, which in turn influenced mood factors, including depression, which then influenced suicidality. At the theoretical level, results supported Attachment Theory (Bowlby, 1969), demonstrating that perceived parenting styles that are warm and not overly controlling are more conducive to an adolescent's emotional well-being than are parenting styles that are cold and controlling. Further, results supported Millon's theory of personality (1981), demonstrating that parenting style influences a child's personality. Short-term intervention effects from the internet site were a decrease in Introversion for the full sample, and decreased Inhibition and Suicidality for a high-risk subgroup. Long-term age effects were decreased Inhibition and increased Anxiety for the fall sample. There was also a probable intervention effect for Depression for the high-risk subgroup. No location differences for the risk factors were found between regional and rural areas.

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Dimensionality of the Colquitt justice measures was investigated across a wide range of service occupations. Structural equation modeling of data from 410 survey respondents found support for the 4-factor model of justice (procedural, distributive, interpersonal, and informational), although significant improvement of model fit was obtained by including a new latent variable, “procedural voice,” which taps employees’ desire to express their views and feelings and influence results. The model was confirmed in a second sample (N = 505) in the same organization six months later.