Search for dissertations about: "Multiple regression"

Showing result 1 - 5 of 449 swedish dissertations containing the words Multiple regression.

  2. 1. Multivariate Aspects of Phylogenetic Comparative Methods

    Author : Krzysztof Bartoszek; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; General Linear Model; Ornstein-Uhlenbeck process; Multivariate phylogenetic comparative method; Evolutionary model; Adaptation; Optimality; Measurement error; Regression; Adaptation; Major-axis regression; Reduced major-axis regression; Structural equation; Allometry; Phylogenetic inertia; Allometry;

    Abstract : his thesis concerns multivariate phylogenetic comparative methods. We investigate two aspects of them. The first is the bias caused by measurement error in regression studies of comparative data. We calculate the formula for the bias and show how to correct for it. READ MORE

  4. 2. Multiple Time Scales and Longitudinal Measurements in Event History Analysis

    Author : Danardono; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Statistics; Cox regression; multiple events; proportiona hazards; random effects; survival analysis; time-dependent covariates; time origin; Statistik; Statistics; Statistik; Statistics; statistik;

    Abstract : A general time-to-event data analysis known as event history analysis is considered. The focus is on the analysis of time-to-event data using Cox's regression model when the time to the event may be measured from different origins giving several observable time scales and when longitudinal measurements are involved. READ MORE

  5. 3. Evaluation of Students' Attitudes Towards Vocational Education in Jordan

    Author : Ahmed Al-Sa'd; Malmö högskola; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; attitudes; students attitudes; vocational education; psychometrics; scaling techniques; factor analysis; multiple regression; logistic regression; attitude behaviour relationship;

    Abstract : This doctoral dissertation consists of the empirical main study and the explorative study. The main goal of the empirical study has been to acquire knowledge about students’ attitudes towards vocational education in Jordan, and to explore the dimensionality of their attitudes as well. READ MORE

  6. 4. Identifying Influential Observations in Nonlinear Regression : a focus on parameter estimates and the score test

    Author : Karin Stål; Tatjana von Rosen; Sune Karlsson; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Added parameter plot; differentiation approach; influential observation; nonlinear regression; score test; Statistics; statistik;

    Abstract : This thesis contributes to influence analysis in nonlinear regression and in particular the detection of influential observations. The focus is on a regression model with a known mean function, which is nonlinear in its parameters and where the function is chosen according to the knowledge about the process generating the data. READ MORE

  7. 5. Environmental risk factors for multiple sclerosis

    Author : Jonatan Salzer; Peter Sundström; Kjell-Morten Myhr; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Multiple sclerosis; risk factors in epidemiology; prospective; month of birth; vitamin D; vitamin A; C-reactive protein; hygiene hypothesis; smoking; cotinine; Epstein-Barr virus; Epidemiology; epidemiologi;

    Abstract : Background Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system. It usually strikes during young adulthood, and 2.5 million individuals are estimated to have the disease worldwide. READ MORE