Sökning: "Nonparametric regression"

Visar resultat 11 - 15 av 18 avhandlingar innehållade orden Nonparametric regression.

  1. 11. Monotonic and Semiparametric Regression for the Detection of Trends in Environmental Quality Data

    Författare :Mohamed Hussian; Anders Grimvall; Ali Hadi; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Normalisation; Monotonic; Semiparametric; Temporal trends; fluctuations; global; local; Matematisk statistik; Icke-parametriska metoder; Statistics; Statistik;

    Sammanfattning : Natural fluctuations in the state of the environment can long conceal or distort important trends in the human impact on our ecosystems. Accordingly, there is increasing interest in statistical normalisation techniques that can clarify the anthropogenic effects by removing meteorologically driven fluctuations and other natural variation in time series of environmental quality data. LÄS MER

  3. 12. Structural Reformulations in System Identification

    Författare :Christian Lyzell; Martin Enqvist; Lennart Ljung; Alessandro Chiuso; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; System identification; Dimension reduction; Subspace identification; Difference algebra;

    Sammanfattning : In system identification, the choice of model structure is important and it is sometimes desirable to use a flexible model structure that is able to approximate a wide range of systems. One such model structure is the Wiener class of systems, that is, systems where the input enters a linear time-invariant subsystem followed by a time-invariant nonlinearity. LÄS MER

  4. 13. Correlated random effects models for clustered survival data

    Författare :Frank Eriksson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; competing risks; case-cohort; semiparametric; Survival analysis; random effects; routine register; frailty model; Survival analysis; frailty model; competing risks; random effects; case-cohort; routine register; semiparametric;

    Sammanfattning : Frailty models are frequently used to analyse clustered survival data in medical contexts. The frailties, or random effects, are used to model the association between individual survival times within clusters. LÄS MER

  5. 14. Probabilistic machine learning methods for automated radiation therapy treatment planning

    Författare :Tianfang Zhang; Jimmy Olsson; Steve Jiang; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Matematisk statistik; Mathematical Statistics;

    Sammanfattning : In this thesis, different parts of an automated process for radiation therapy treatment planning are investigated from a mathematical and computational perspective. Whereas traditional inverse planning is labor-intensive, often comprising several reiterations between treatment planner and physician before a plan can be approved, much of recent research have been aimed at using a data-driven approach by learning from historically delivered plans. LÄS MER

  7. 15. Effects of perinatal distress, satisfaction in partner relationship and social support on pregnancy and outcome of childbirth

    Författare :Sigridur Sia Jonsdottir; Katarina Swahnberg; Margareta Larsson; Linnéuniversitetet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; perinatal distress; partner relationship; social support; pregnancy; sick leave certificates; childbirth; midwifery; self-reported scales; DASS; EPDS; DAS; MSPSS; Vårdvetenskap; Caring Science;

    Sammanfattning : Aim: The aim of this thesis was to achieve a deeper understanding of the situation among women experiencing perinatal distress during pregnancy and childbirth and the effects that dissatisfaction in partner relationship and weak social support from family and friends could have on pregnancy and childbirth.Methods: Following screening for perinatal distress, 562 expecting mothers came for a semi-structured interview. LÄS MER