Sökning: "Penalized Regression"

Hittade 5 avhandlingar innehållade orden Penalized Regression.

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

    Författare :Othmane Mazhar; Boualem Djehiche; Cristian R. Rojas; Carlo Fischione; Mohammad Reza Hesamzadeh; Boualem Djehiche; Munther Dahleh; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; 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; Mathematical Statistics; Matematisk statistik;

    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

  2. 2. Generalized survival models as a tool for medical research

    Författare :Xingrong Liu; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP;

    Sammanfattning : In medical research, many studies with the time-to-event outcomes investigate the effect of an exposure (or treatment) on patients’ survival. For the analysis of time-to-event or survival data, model-based approaches have been commonly applied. LÄS MER

  3. 3. Identification of pathophysiological and prognostic biomarkers in different types of myocardial infarction

    Författare :Marcus Hjort; Bertil Lindahl; Kai M. Eggers; Helge Rørvik Røsjø; Uppsala universitet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; myocardial infarction; biomarker; pathophysiology; prognosis; MINOCA; STEMI; NSTEMI; hjärtinfarkt; biomarkör; patofysiologi; prognos; MINOCA; STEMI; NSTEMI; Cardiology; Kardiologi;

    Sammanfattning : The pathophysiological mechanisms of myocardial infarction (MI) with non-obstructive coronary arteries (MINOCA) are largely unknown. Analogous, differences in pathobiology between ST-elevation myocardial infarction (STEMI) and non-ST-elevation myocardial infarction (NSTEMI) are incompletely understood. LÄS MER

  4. 4. Latent variable models for multivariate survival and count data

    Författare :Samuli Ripatti; David Clayton; Stockholms universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; matematisk statistik; Mathematical Statistics;

    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

  5. 5. 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 :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; 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