Sökning: "covariates"

Visar resultat 21 - 25 av 131 avhandlingar innehållade ordet covariates.

  1. 21. Bayesian Modeling of Conditional Densities

    Författare :Feng Li; Mattias Villani; Sylvia Frühwirth-Schnatter; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Bayesian inference; Density estimation; smooth mixtures; surface regression; copulas; Markov chain Monte Carlo; Statistics; statistik;

    Sammanfattning : This thesis develops models and associated Bayesian inference methods for flexible univariate and multivariate conditional density estimation. The models are flexible in the sense that they can capture widely differing shapes of the data. The estimation methods are specifically designed to achieve flexibility while still avoiding overfitting. LÄS MER

  3. 22. Data driven modeling in the presence of time series structure: : Improved bounds and effective algorithms

    Författare :Othmane Mazhar; Boualem Djehiche; Munther Dahleh; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Time series; Non-asymptotic estimation; Minimax; Change point detection; Hidden Markov model; State space model; Least square; Penalized Regression; Random covariance matrix; Concentration inequality; Chaining integral; Self-normalized martingale inequality; Cramér-Rao inequality; van Trees inequality; Matematisk statistik; Mathematical Statistics;

    Sammanfattning : This thesis consists of five appended papers devoted to modeling tasks where the desired models are learned from data sets with an underlying time series structure. We develop a statistical methodology for providing efficient estimators and analyzing their non-asymptotic behavior. LÄS MER

  4. 23. I själ och hjärta - Psykosociala faktorer och hjärt-kärlhälsa

    Författare :Yvonne Natt och Dag; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Psychosocial epidemiology; Psychological distress; Psychosocial factors; Cardiovascular disease; Atherosclerosis;

    Sammanfattning : Cardiovascular disease (CVD) is the leading cause of death in Sweden and worldwide. Although the prevalence is declining in the Western world there are signs of rising prevalence among the young. LÄS MER

  5. 24. Some Aspects of Propensity Score-based Estimators for Causal Inference

    Författare :Ronnie Pingel; Johan Lyhagen; Theis Lange; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; correlation; treatment effect; inverse probability weighting; local linear estimator; matching; multicollinearity; observational study.; Statistics; Statistik;

    Sammanfattning : This thesis consists of four papers that are related to commonly used propensity score-based estimators for average causal effects.The first paper starts with the observation that researchers often have access to data containing lots of covariates that are correlated. LÄS MER

  7. 25. Two Essays on Households' Income Resources, Formation and Income Levels in South Africa

    Författare :Sten Dieden; Göteborgs universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Sammanfattning : With the ambition to further improve the understanding of income generation among the formerly underprivileged and often impoverished majority of households in South Africa, this study of household survey data analyses households' integration into the South African core economy. The emerging picture of household income generation is one that disputes common perceptions of the multitude of means by which African households generate their income. LÄS MER