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Bayesian analysis of latent variable models. / CUHK electronic theses & dissertations collectionJanuary 2009 (has links)
Pan, Junhao. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 121-135). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.
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Estratégias de internacionalização: um estudo sobre a influência dos fatores de riscos sobre a estratégia e objetivos estratégicos em empresas exportadoras brasileiras / Internationalization strategies: a study on the influence of risk factor on strategy and strategic objectives in brazilian exporting companiesSouza, Crisomar Lôbo de 28 March 2017 (has links)
O ambiente competitivo e globalização vem provocando mudanças nas estratégias das empresas, fomentando, muitas vezes, para um processo de internacionalização. As empresas procuram internacionalizar-se de acordo com seus objetivos estratégicos, traçando uma estratégia de internacionalização. Sair do seu ambiente para um país desconhecido significa que a empresa estará sujeita a correr certos riscos e, portanto, requer uma estratégia que avalie os riscos envolvidos para se estabelecer em um determinado país. O conhecimento desses riscos vai proporcionar a empresa mitigar ou mesmo eliminar os riscos envolvidos. Independente do processo de entrada em outro país, sempre haverá a questão do risco. Geralmente, quando uma empresa decide se internacionalizar, ela opta primeiro pelo processo de exportação, em que terá de lidar com vários tipos de risco em suas decisões gerenciais para alcançar seus objetivos estratégicos. Portanto, essa pesquisa foi feita com oitenta e quatro empresas exportadoras brasileiras, do estado de São Paulo, com faturamento de até 10 milhões de dólares listadas na Confederação Nacional da Indústria (CNI). O objetivo desse estudo foi entender como e quais riscos envolvidos na internacionalização de empresas exportadoras brasileiras exercem influência sobre a estratégia e objetivos estratégicos na internacionalização de empresas exportadoras. Para a análise da pesquisa, foi utilizada a técnica de modelagem de equações estruturais baseada em variância, na qual foi utilizada uma survey para coleta de dados. Foram geradas quatro hipóteses, três relacionadas ao risco e estratégia e uma relacionada à estratégia e ao risco. Como resultado, duas hipóteses foram confirmadas e, portanto, duas rejeitadas. Essa pesquisa contribui com o conhecimento científico, pois, além de verificar os riscos que influenciam na estratégia e objetivos estratégicos, ela traz a concepção de envolver riscos não somente financeiros, mas também do ambiente, do setor e da empresa na estratégia para a internacionalização. / The competitive environment and globalization has been provoking changes in the strategies of companies, often leading to an internationalization process. The companies seek to internationalize themselves according to their strategic objectives, to which a strategy of internationalization will be traced. Leaving your environment to an unknown country means that the company is subject to certain risks and therefore requires a strategy that assesses the risks involved in establishing itself in a particular country. Knowing these risks will enable the company to mitigate or even eliminate the risks involved. Regardless of the process of entry into another country, there will always be the issue of risk. Usually, when a company decides to internationalize, it opts for the first time through the export process, where it will have to deal with various types of risk in its managerial decisions to reach its strategic objectives. Therefore, this research was conducted with eighty-four Brazilian companies in the state of São Paulo, with sales of up to 10 million dollars listed in Confederação Nacional da Indústria (CNI). The objective of the study was to understand how and what risks involved in the internationalization of Brazilian exporting companies influence the strategy and the strategic objectives in the internationalization of exporting companies. But even this process depending on the intensity of export the company will be subject to risk because it is unknown to the host country. Therefore, this research was carried out with Brazilian export companies, whose objective was to investigate the influence of the risks involved in the internationalization of Brazilian exporting companies on the strategy of internationalization and strategic objectives. For the analysis of the research was used the technique of modeling of structural equations based on variance, where a survey was used to collect data. Four hypotheses were generated, three related to risk and strategy and one related to strategy and risk. As a result, two hypotheses were confirmed and therefore two rejected. This research contributes with scientific knowledge, because in addition to verifying the risks that influence the strategy and strategic objectives, it brings the concept of involving not only financial risks but also the risk of the environment, sector and the company in the strategy for internationalization.
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Student Column: Evaluating a Theoretical Model of Indoor Tanning Using Structural Equation ModelingScott, Colleen, Hillhouse, Joel J., Turrisi, Rob 01 January 2014 (has links)
No description available.
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Emotional and Cognitive Engagement in Higher Education ClassroomsManwaring, Kristine C. 01 December 2017 (has links)
This is a multi-article format dissertation that explores emotional and cognitive engagement in higher education classrooms. Student engagement in higher education classrooms has been associated with desired outcomes such as academic achievement, retention, and graduation. Student engagement is a multi-faceted concept, consisting of behavioral, emotional, and cognitive components. A deeper understanding of how these components interact would allow instructors and course designers to facilitate more engaging learning experiences for students. The first article is an extended literature review that investigates the extant empirical research on the relationship between emotional and cognitive engagement, and between emotional engagement and academic outcomes in post-secondary classrooms. I find that this topic has been scantily researched in the past 16 years and conclude that the relationship between emotional and cognitive engagement is cyclical, rather than linear, and is influenced by student control appraisals, value appraisals, achievement goals, and the classroom environment. The second article investigates the longitudinal relationship between emotional and cognitive engagement in university blended learning courses across 2 institutions, with 68 students. Using intensive longitudinal data collection and structural equation modeling, I find that course design and student perception variables have a greater influence on engagement than individual student characteristics and that student multitasking has a strong negative influence on engagement. Students' perceptions of the importance of the activity has a strong positive influence on both cognitive and emotional engagement. An important outcome of engagement is the students' perceptions that they were learning and improving. While emotional and cognitive engagement are highly correlated, the results do not indicate that emotional engagement leads to higher levels of cognitive engagement.
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Conceptualizing Blended Learning EngagementHalverson, Lisa R. 01 July 2016 (has links)
Learner engagement, or the involvement of the student's cognitive and emotional energy to accomplish a learning task, has been called "the holy grail of learning" (Sinatra, Heddy, & Lombardi, 2015, p. 1) because of its correlations to academic achievement, persistence, and satisfaction. In the 21st century, learning will be increasingly "blended," combining face-to-face with computer-mediated instruction. Research is already exploring learner engagement in blended contexts, but no theoretical framework guides inquiry or practice. Developing models and measures of the factors that facilitate learner engagement is important to the advancement of the domain. This multiple-article format dissertation addresses the theoretical gap in research on learner engagement in blended settings. The first article reviews the existing literature on learner engagement, delineates a set of constructs most relevant to the contexts of blended learning, and proposes a theoretical framework for learner engagement in blended settings. The second article operationalizes and tests the proposed model of blended learning engagement using exploratory and confirmatory factor analysis. It creates and evaluates an end-of-course self-report measure of cognitive and emotional engagement. The unique factor structure of online and face-to-face indicators of learner engagement is clearly demonstrated in the results of this study.
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AFFECT, MOTIVATION, AND ENGAGEMENT IN THE CONTEXT OF MATHEMATICS EDUCATION: TESTING A DYNAMIC MODEL OF INTERACTIVE RELATIONSHIPSHu, Shanshan 01 January 2018 (has links)
The present study tested the interactive model of affect, motivation, and engagement (Linnenbrink, 2007) in mathematics education with a nationally representative sample. Self-efficacy, self-concept, and anxiety were indicators of pleasant and unpleasant affect. Intrinsic and extrinsic motivation were indicators of mastery and performance approach. Persistence and cognitive activation were indicators of behavioral and cognitive engagement. The 2012 Programme for International Student Assessment (PISA) supplied a sample of 4,978 students from the United States for structural equation modeling. The results indicated that PISA data overall supported the interactive model. Specifically, PISA data completely supported the specification of the relationship between motivation and affect, largely supported the specification of the relationship between affect and engagement, but failed to support the specification of the relationship between motivation and engagement. Finally, PISA data largely supported the specification of the mediation effects of affect on the relationship between motivation and engagement.
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OPTIMIZATION FOR STRUCTURAL EQUATION MODELING: APPLICATIONS TO SUBSTANCE USE DISORDERSZahery, Mahsa 01 January 2018 (has links)
Substance abuse is a serious issue in both modern and traditional societies. Besides health complications such as depression, cancer and HIV, social complications such as loss of concentration, loss of job, and legal problems are among the numerous hazards substance use disorder imposes on societies. Understanding the causes of substance abuse and preventing its negative effects continues to be the focus of much research.
Substance use behaviors, symptoms and signs are usually measured in form of ordinal data, which are often modeled under threshold models in Structural Equation Modeling (SEM). In this dissertation, we have developed a general nonlinear optimizer for the software package OpenMx, which is a SEM package in widespread use in the fields of psychology and genetics. The optimizer solves nonlinearly constrained optimization problems using a Sequential Quadratic Programming (SQP) algorithm. We have tested the performance of our optimizer on ordinal data and compared the results with two other optimizers (implementing SQP algorithm) available in the OpenMx package. While all three optimizers reach the same minimum, our new optimizer is faster than the other two.
We then applied OpenMx with our optimization engine to a very large population-based drug abuse dataset, collected in Sweden from over one million pairs, to investigate the effects of genetic and environmental factors on liability to drug use.
Finally, we investigated the reasons behind better performance of our optimizer by profiling all three optimizers as well as analyzing their memory consumption. We found that objective function evaluation is the most expensive task for all three optimizers, and that our optimizer needs fewer number of calls to this function to find the minimum. In terms of memory consumption, the optimizers use the same amount of memory.
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Performance measurement for highway winter maintenance operationsQiu, Lin 01 January 2008 (has links)
Many highway maintenance agencies are facing an increased pressure to utilize their limited resources while still achieving the optimum winter highway maintenance outcome. Also there is a tendency to privatize maintenance operation, in order to improve the road user's satisfaction by bringing more competition to winter maintenance operations. Given this context the purpose of this research is to develop an effective performance measurement system that can evaluate how well agencies have conducted winter maintenance activities to meet the road user's expectations of safety and mobility.
Though there have been performance measurement studies conducted in the winter maintenance area, few of them are comprehensive enough to evaluate winter maintenance outcomes, while at the same time taking storm severity, road system characteristics, and maintenance effort together into consideration. To address this deficiency, several particular challenges must be considered: first, how to evaluate the storm severity for individual storms; second, how to evaluate maintenance outcomes using a series of quantitative measures; and third, what are the appropriate targets that maintenance outcomes can be compared with, considering outcomes are sensitive to maintenance input, weather severity, road classifications, and traffic specifications. To address these questions: A storm severity index is developed; studies on effects of weather were quantitatively synthesized by meta-analysis; effects of weather and maintenance on road surface conditions are estimated by MLR; SEM (Structural Equation Modeling) is applied to estimate the direct and indirect effects of maintenance on mobility and Multiple Classification Analysis (MCA) was applied to estimate the contribution of winter maintenance to safety.
The final result of this research is an applicable winter maintenance performance measurement system. It informs maintenance agencies where they excel at and where improvements are needed for the specified goals. Further, the developed road surface condition prediction model can be used as a predictive tool to allow agencies to conduct "what if" experiments that will lead to optimization of maintenance practice over time.
The relative magnitudes of the effects of different maintenance methods on mobility and safety that is estimated by the models will enable agencies to assign priorities, and to compare maintenance outcomes based on the input resources.
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Young's Schema Theory: Exploring the Direct and Indirect Links Between Negative Childhood Experiences and Temperament to Negative Affectivity In AdulthoodJesinoski, Mark S. 01 December 2010 (has links)
Young's schema theory offers a theoretical approach that relates negative childhood experiences, temperament, and early maladaptive schema, to the experience of negative affect and/or depression in adulthood. However, despite the widespread use of schema therapy in clinical practice, little research has explored the pathways theorized by Young. This study explored the pathways posited by Young and colleagues looking at the direct and indirect relationships among negative childhood experience, temperament, early maladaptive schema, and the experience of negative affect in adulthood.
Self-report data were collected from 365 undergraduate students. Results demonstrated consistent and robust direct relationships between temperament and negative affect, as well as indirect relationships between temperament and/or NCE, schema, and the outcome of negative affect. Results, though mixed, reveal strengths of the schema therapy model and provide suggestions for future research.
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Social Network Analysis of Researchers' Communication and Collaborative Networks Using Self-reported DataCimenler, Oguz 16 June 2014 (has links)
This research seeks an answer to the following question: what is the relationship between the structure of researchers' communication network and the structure of their collaborative output networks (e.g. co-authored publications, joint grant proposals, and joint patent applications), and the impact of these structures on their citation performance and the volume of collaborative research outputs? Three complementary studies are performed to answer this main question as discussed below.
1. Study I: A frequently used output to measure scientific (or research) collaboration is co-authorship in scholarly publications. Less frequently used are joint grant proposals and patents. Many scholars believe that co-authorship as the sole measure of research collaboration is insufficient because collaboration between researchers might not result in co-authorship. Collaborations involve informal communication (i.e., conversational exchange) between researchers. Using self-reports from 100 tenured/tenure-track faculty in the College of Engineering at the University of South Florida, researchers' networks are constructed from their communication relations and collaborations in three areas: joint publications, joint grant proposals, and joint patents. The data collection: 1) provides a rich data set of both researchers' in-progress and completed collaborative outputs, 2) yields a rating from the researchers on the importance of a tie to them 3) obtains multiple types of ties between researchers allowing for the comparison of their multiple networks. Exponential Random Graph Model (ERGM) results show that the more communication researchers have the more likely they produce collaborative outputs. Furthermore, the impact of four demographic attributes: gender, race, department affiliation, and spatial proximity on collaborative output relations is tested. The results indicate that grant proposals are submitted with mixed gender teams in the college of engineering. Besides, the same race researchers are more likely to publish together. The demographics do not have an additional leverage on joint patents.
2. Study II: Previous research shows that researchers' social network metrics obtained from a collaborative output network (e.g., joint publications or co-authorship network) impact their performance determined by g-index. This study uses a richer dataset to show that a scholar's performance should be considered with respect to position in multiple networks. Previous research using only the network of researchers' joint publications shows that a researcher's distinct connections to other researchers (i.e., degree centrality), a researcher's number of repeated collaborative outputs (i.e., average tie strength), and a researchers' redundant connections to a group of researchers who are themselves well-connected (i.e., efficiency coefficient) has a positive impact on the researchers' performance, while a researcher's tendency to connect with other researchers who are themselves well-connected (i.e., eigenvector centrality) had a negative impact on the researchers' performance. The findings of this study are similar except that eigenvector centrality has a positive impact on the performance of scholars. Moreover, the results demonstrate that a researcher's tendency towards dense local neighborhoods (as measured by the local clustering coefficient) and the researchers' demographic attributes such as gender should also be considered when investigating the impact of the social network metrics on the performance of researchers.
3. Study III: This study investigates to what extent researchers' interactions in the early stage of their collaborative network activities impact the number of collaborative outputs produced (e.g., joint publications, joint grant proposals, and joint patents). Path models using the Partial Least Squares (PLS) method are run to test the extent to which researchers' individual innovativeness, as determined by the specific indicators obtained from their interactions in the early stage of their collaborative network activities, impacts the number of collaborative outputs they produced taking into account the tie strength of a researcher to other conversational partners (TS). Within a college of engineering, it is found that researchers' individual innovativeness positively impacts the volume of their collaborative outputs. It is observed that TS positively impacts researchers' individual innovativeness, whereas TS negatively impacts researchers' volume of collaborative outputs. Furthermore, TS negatively impacts the relationship between researchers' individual innovativeness and the volume of their collaborative outputs, which is consistent with `Strength of Weak Ties' Theory. The results of this study contribute to the literature regarding the transformation of tacit knowledge into explicit knowledge in a university context.
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