Search for dissertations about: "multi-group analysis"

Showing result 1 - 5 of 7 swedish dissertations containing the words multi-group analysis.

2. 1. Essays on Estimation Methods for Factor Models and Structural Equation Models

   Author : Shaobo Jin; Fan Yang-Wallentin; Rolf Larsson; Li Cai; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; shrinkage; factor rotation; penalized maximum likelihood; pseudo-maximum likelihood; multi-group analysis; ordinal data; robustness; Statistics; Statistik;

   Abstract : This thesis which consists of four papers is concerned with estimation methods in factor analysis and structural equation models. New estimation methods are proposed and investigated.In paper I an approximation of the penalized maximum likelihood (ML) is introduced to fit an exploratory factor analysis model. READ MORE

4. 2. Predicting Xenon Oscillations in PWRs using Intrusive Reduced Order Modelling

   Author : Kristoffer Pedersen; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Reduced Order Modeling; Modal Decomposition; Multi-Group Diffusion Theory; Xenon Oscillations;

   Abstract : The increasing presence of intermittent energy sources in the Swedish electricity grid necessitates a transition of Swedish nuclear reactors from constant base load operation to load-following mode. However, such changes in power can induce xenon oscillations, a phenomenon that poses operational challenges and the risk of fuel damage. READ MORE

5. 3. Some Aspects on Confirmatory Factor Analysis of Ordinal Variables and Generating Non-normal Data

   Author : Hao Luo; Fan Yang-Wallentin; Johan Lyhagen; Karl Jöreskog; Marie Wiberg; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; confirmatory factor analysis; ordinal variables; maximum likelihood; weighted least squares; polychoric correlation; non-normal data; Fleishman s method; Monte Carlo simulation; Statistics; Statistik; Statistics; Statistik;

   Abstract : This thesis, which consists of five papers, is concerned with various aspects of confirmatory factor analysis (CFA) of ordinal variables and the generation of non-normal data. The first paper studies the performances of different estimation methods used in CFA when ordinal data are encountered. READ MORE

6. 4. Power Reactor Noise Studies and Applications

   Author : Vasiliy Arzhanov; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; power spectra; control rod vibrations; Green s function; nesting hypothesis; adjoint function; fluctuating boundary; noise diagnostics; Accelerator Driven System; localisation algorithm; point reactor and adiabatic approximation;

   Abstract : The present thesis deals with the neutron noise arising in power reactor systems. Generally, it can be divided into two major parts: first, neutron noise diagnostics, or more specifically, novel methods and algorithms to monitor nuclear industrial reactors; and second, contributions to neutron noise theory as applied to power reactor systems. READ MORE

7. 5. From market orientation to orientation towards international marjets (OIM) of born global firms : evaluating the impact of OIM on born global firms' performance

   Author : Rosalina Torres-Ortega; Spain Autonomous University of Barcelona; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Born global firms; market orientation; orientation towards international markets; performance; scale validation; multi-country approach; structural equation model; Företagsekonomi; Business administration;

   Abstract : Although there is a considerable amount of research on market orientation, research on this concept in the context of born global firms is still lacking a precise definition and full operationalization. This research aims to investigate how the market orientation (MO) concept could be understood for a specific type of firm: the born global firm. READ MORE