Sökning: "outcome dependent sampling"

Visar resultat 1 - 5 av 11 avhandlingar innehållade orden outcome dependent sampling.

  1. 1. Design and analysis of response selective samples in observational studies

    Författare :Maria Grünewald; Ola Hössjer; Keith Humphreys; Marie Reilly; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ascertainment; missing data; outcome dependent sampling; response selective samples; sequential design; stochastic EM algorithm; Mathematical statistics; Matematisk statistik; Mathematical Statistics; matematisk statistik;

    Sammanfattning : Outcome dependent sampling may increase efficiency in observational studies. It is however not always obvious how to sample efficiently, and how to analyze the resulting data without introducing bias. LÄS MER

  3. 2. Some properties of measures of disagreement and disorder in paired ordinal data

    Författare :Hans Högberg; Elisabeth Svensson; Sture Holm; Örebro universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; agreement; augmented ranks; categorical data; disorder; jackknife; paired ordinal data; rating scales; sample size; sampling distribution; simulation; U-statistics; variance; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; Statistics; Statistik; Statistics; Statistik;

    Sammanfattning : The measures studied in this thesis were a measure of disorder, D, and a measure of the individual part of the disagreement, the measure of relative rank variance, RV, proposed by Svensson in 1993. The measure of disorder is a useful measure of order consistency in paired assessments of scales with a different number of possible values. LÄS MER

  4. 3. Treatment of alcohol dependence in primary care

    Författare :Karin Hyland; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Alcohol dependence is a common disorder and contributes to substantial morbidity and mortality globally. Only 10-20 percent engage in treatment, which makes alcohol dependence the mental disorder with the largest treatment gap. Most individuals with alcohol dependence have a dependence of low to moderate severity. LÄS MER

  5. 4. Definitions of Disability in Social Sciences : Methodological Perspectives

    Författare :Lars Grönvik; Mårten Söder; Jan Tøssebro; Uppsala universitet; []
    Nyckelord :Sociology; disability; concept analysis; methodology; definitions; disability research; Sociologi;

    Sammanfattning : This dissertation examines how disability researchers define disability. It is based on four studies. The first describes different definitions of disability in disability research. The second study is a conceptual analysis of the use of disability in a sample of disability research classics. LÄS MER

  7. 5. From cell survival to dose response : modeling biological effects in radiation therapy

    Författare :Minna Wedenberg; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Radiobiological models;

    Sammanfattning : The main goal in curative radiation therapy is to eradicate the tumor while minimizing radiation-induced damage to normal tissue. Ions, including protons and carbon ions, are increasingly being used for cancer treatment. LÄS MER