Sökning: "Statistiska institutionen"

Visar resultat 11 - 15 av 235 avhandlingar innehållade orden Statistiska institutionen.

  1. 11. Some Investigations into the Class of Exponential Power Distributions

    Författare :Lukas Arnroth; M. Rauf Ahmad; Patrik Andersson; Matúš Maciak; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Exponential power distribution; Skewed exponential power distribution; linear mixed models; score test; Lp-quantiles; quantile regression; posterior convergence rate; Statistics; Statistik;

    Sammanfattning : In this thesis, methods are developed relating to the exponential power class of distributions.Paper I considers Bayesian linear mixed models where the usual normality assumption is replaced by the multivariate exponential power distribution. Particular focus lies on Bayesian testing of the fixed effects. LÄS MER

  3. 12. Statistical modeling and design in forestry : The case of single tree models

    Författare :Leakemariam Berhe; Göran Arnoldsson; Göran Broström; Dieter Rasch; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Forest data; Covariance structures; Nonlinear mixed effects models; Tree taper models; Ds-optimal design; Replication-free design.; Statistics; Statistik;

    Sammanfattning : Forest quantification methods have evolved from a simple graphical approach to complex regression models with stochastic structural components. Currently, mixed effects models methodology is receiving attention in the forestry literature. LÄS MER

  4. 13. Bayesian risk analysis of rare events, such as catastrophes, by means of expert assessments

    Författare :Saers Elizabeth Bigün; Stockholms universitet; []
    Nyckelord :Statistics; computer and systems science; Statistik; data- och systemvetenskap; statistik; Statistics;

    Sammanfattning : .... LÄS MER

  5. 14. Test Design for Mean Ability Growth and Optimal Item Calibration for Achievement Tests

    Författare :Jonas Bjermo; Frank Miller; Marie Wiberg; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; test design; item response theory; optimal experimental design; SweSAT; item calibration; vertical scaling; ability growth; computerized adaptive tests; Statistics; statistik;

    Sammanfattning : In this thesis, we examine two topics in the area of educational measurement. The first topic studies how to best design two achievement tests with common items such that a population mean-ability growth is measured as precisely as possible. The second examines how to calibrate newly developed test items optimally. LÄS MER

  7. 15. Analysis of Fetal Heart Rate Variability During Labour : Registration, Estimation, and Decision

    Författare :Åke Björnham; Dan-Erik Wiklund; Umeå universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER