Search for dissertations about: "Anders Lundquist"

Showing result 1 - 5 of 6 swedish dissertations containing the words Anders Lundquist.

  2. 1. Line based visual navigation using pose clustering

    Author : Anders Lundquist; KTH; []
    Keywords : ;

    Abstract : .... READ MORE

  4. 2. Contributions to the theory of unequal probability sampling

    Author : Anders Lundquist; Lennart Bondesson; Aleksandras Plikusas; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; balanced sampling; conditional Poisson sampling; inclusion probabilities; maximum entropy; Markov chain Monte Carlo; Pareto sampling; Sampford sampling; unequal probability sampling.; Mathematical statistics; Matematisk statistik; Mathematical Statistics; matematisk statistik;

    Abstract : This thesis consists of five papers related to the theory of unequal probability sampling from a finite population. Generally, it is assumed that we wish to make modelassisted inference, i.e. the inclusion probability for each unit in the population is prescribed before the sample is selected. READ MORE

  5. 3. Methods for longitudinal brain imaging studies with dropout

    Author : Tetiana Gorbach; Xavier de Luna; Anders Lundquist; Martin A. Lindquist; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Missing data; nonignorable dropout; sensitivity analysis; uncertainty intervals; pattern-mixture models; aging; cognition; MRI; brain structure; resting-state functional connectivity; Statistics; statistik;

    Abstract : One of the challenges in aging research is to understand the brain mechanisms that underlie cognitive development in older adults. Such aging processes are investigated in longitudinal studies, where the within-individual changes over time are observed. However, several methodological issues exist in longitudinal analyses. READ MORE

  6. 4. Attrition in Studies of Cognitive Aging

    Author : Maria Josefsson; Xavier de Luna; Lars Nyberg; Anders Lundquist; Mattias Villani; Umeå universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Attrition; missing data; age-related cognitive change; non- ignorable dropout; monotone missing pattern; mixture models; pattern- mixture models; imputation; Statistics; statistik;

    Abstract : Longitudinal studies of cognition are preferred to cross-sectional stud- ies, since they offer a direct assessment of age-related cognitive change (within-person change). Statistical methods for analyzing age-related change are widely available. READ MORE

  7. 5. The genetics of schizophrenia : sex, drugs, and cognition

    Author : Elise Koch; Karolina Kauppi; Lars Nyberg; Anders Lundquist; Alessandro Serretti; Umeå universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; schizophrenia; genetics; cognition; sex differences; polygenic risk; fMRI; network medicine; drug repurposing; precision medicine;

    Abstract : Cognitive impairment constitutes an important predictor of general functional outcomes in schizophrenia. Polygenic risk for schizophrenia has been linked to cognitive ability as well as brain activation during cognitive processing. READ MORE