Sökning: "latent variable analysis"

Visar resultat 11 - 15 av 38 avhandlingar innehållade orden latent variable analysis.

  1. 11. Towards a flexible statistical modelling by latent factors for evaluation of simulated responses to climate forcings

    Författare :Ekaterina Fetisova; Gudrun Brattström; Anders Moberg; Rolf Sundberg; Johan Lindström; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Confirmatory Factor Analysis; Measurement Error models; Structural Equation models; Wald confidence interval; Fieller confidence set; Climate model simulations; Climate forcings; Climate proxy data; Detection and Attribution; Mathematical Statistics; matematisk statistik;

    Sammanfattning : In this thesis, using the principles of confirmatory factor analysis (CFA) and the cause-effect concept associated with structural equation modelling (SEM), a new flexible statistical framework for evaluation of climate model simulations against observational data is suggested. The design of the framework also makes it possible to investigate the magnitude of the influence of different forcings on the temperature as well as to investigate a general causal latent structure of temperature data. LÄS MER

  3. 12. Asymptotic Analysis of Hedging Errors Induced by Discrete Time Hedging

    Författare :Mats Brodén; Matematisk statistik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Discrete time hedging; discretization error; L2 convergence; Non-linear Kalman filters; Calibration;

    Sammanfattning : The first part of this thesis deals with approximations of stochastic integrals and discrete time hedging of derivative contracts; two closely related subjects. Paper A considers the problem of approximating the value of a Wiener process. LÄS MER

  4. 13. Systems biology approaches to investigate mechanisms of obstructive lung diseases

    Författare :Marika Ström; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Both asthma and chronic obstructive pulmonary disease (COPD) are obstructive lung diseases with a large impact on global health, causing 400 000 and 3 million deaths respectively each year. The numbers may be underestimated, since COPD often contributes to death without being registered as the cause of death. LÄS MER

  5. 14. Kamrateffekter i skolundervisning – En ramfaktorteoretisk analys

    Författare :Pontus Bäckström; Sangeeta Bagga-Gupta; Rebecka Florin Sädbom; Vezir Aktaş; Ulf P. Lundgren; Jönköping University; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; compositional effects; peer effects; frame factor theory; structural equation modelling;

    Sammanfattning : In the educational literature on peer effects, attention has been brought to the fact that the mechanisms creating peer effects are still to a large extent hidden in obscurity. The hypothesis in this study is that the Frame Factor Theory can be used to explain these mechanisms. LÄS MER

  7. 15. Monitoring Wastewater Treatment Systems

    Författare :Christian Rosén; Industriell elektroteknik och automation; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This work considers various techniques to extract information from the vast amount of data collected at a modern wastewater treatment plant. If the information extracted is to be considered reliable is highly dependent on the data screening. Data screening includes validation and quality improvement of data. LÄS MER