Sökning: "nested models"

Visar resultat 16 - 20 av 59 avhandlingar innehållade orden nested models.

  1. 16. Between open systems and closed doors : the needs and perceptions of parents of children with cognitive disabilities in educational settings

    Författare :Lise Roll-Pettersson; Rune Simeonsson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; ABCX model; Cognitive disability; Parents; Teachers; Föräldrar till barn med funktionsnedsättning; Elever med särskilda behov; Lärarrollen; Sverige; pedagogik; Education;

    Sammanfattning : This thesis consists of three papers on multivariate frailty models and one paper on the use of latent class models in genetic association studies. The common theme through the four papers is the use of latent variables to capture complex dependence structures in the data. LÄS MER

  3. 17. Etiological aspects of gastroesophageal cancers : an epidemiological approach

    Författare :Shahram Bahmanyar; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Nutrition; dietary patterns; factor analysis; esophageal cancer; stomach cancer; gastric; cardia; non-cardia; adenocarcinoma; squamous-cell carcinoma; duodenal ulcer; gastric ulcer; estrogen; parity; risk; case-control study; cohort study; nested case-control study; odds ratio; standardized incidence ratio;

    Sammanfattning : Aims: The aims of this thesis were to study the association of overall dietary habits, duodenal ulcer and gastric ulcer diseases, as two models of Helicobacter pylori (H. pylori) infection and the development of gastroesophageal cancers to further explore the etiology of these malignancies. LÄS MER

  4. 18. Statistical Properties of Preliminary Test Estimators

    Författare :Nicklas Korsell; Rolf Larsson; Johan Lyhagen; Tore Schweder; Uppsala universitet; []
    Nyckelord :Statistics; Linear regression; Preliminary test; Model selection; Test for homoscedasticity; Variance components; Truncated estimators; Inertia of matrices; Statistik;

    Sammanfattning : This thesis investigates the statistical properties of preliminary test estimators of linear models with normally distributed errors. Specifically, we derive exact expressions for the mean, variance and quadratic risk (i.e. the Mean Square Error) of estimators whose form are determined by the outcome of a statistical test. LÄS MER

  5. 19. Mode choice modelling of long-distance passenger transport based on mobile phone network data

    Författare :Angelica Andersson; Maria Börjesson; Ida Kristoffersson; Clas Rydergren; Leonid Engelson; Jonas Westin; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Demand model; Mode choice; Latent class; Mobile phone network data; Travel behaviour; Long-distance travel;

    Sammanfattning : Reliable forecasting models are needed to achieve the climate related goals in the face of increasing transport demand. Such models can predict the long-term behavioural response to policy interventions, including infrastructure investments, and thus provide valuable pre-dictions for decision makers. LÄS MER

  7. 20. Computationally efficient methods in spatial statistics : Applications in environmental modeling

    Författare :David Bolin; Matematisk statistik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In this thesis, computationally efficient statistical models for large spatial environmental data sets are constructed. In the first part of the thesis, a method for estimating spatially dependent temporal trends is developed. A space-varying regression model, where the regression coefficients for the spatial locations are dependent, is used. LÄS MER