Search for dissertations about: "ascertainment bias"

Showing result 1 - 5 of 11 swedish dissertations containing the words ascertainment bias.

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

    Author : Maria Grünewald; Ola Hössjer; Keith Humphreys; Marie Reilly; Stockholms universitet; []
    Keywords : 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;

    Abstract : 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. READ MORE

  2. 2. Methodological aspects on excess cancer riskafter exposure to ionizing radiation

    Author : Erik Holmberg; Göteborgs universitet; []
    Keywords : ionizing radiation; skin haemangioma; breast cancer; parathyroid adenoma; excess cancer risk; bias; confounding; risk models; pooled analysis.;

    Abstract : Aims. The aims of this study were to establish a cohort of persons treated with radiotherapy for skin haemangioma in childhood and study the excess risk of cancer after exposure to ionizing radiation. READ MORE

  3. 3. Statistical methods for long-term follow-up of infectious diseases

    Author : Anna Törner; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : The overall aim of this work has been to investigate methodological issues connected to long-term follow-up of infections diseases. The work extended to prevalent cohorts in general. The common denominator for the main methodological efforts in these four papers is issues connected to selection bias. READ MORE

  4. 4. Occupational exposures and malignant lymphoma

    Author : Bodil Persson; Östergötlands Läns Landsting; []
    Keywords : MEDICINE; MEDICIN;

    Abstract : The incidence of malignant lymphoma, especially non-Hodgkin's lymphoma (NHL) has increased over the last few decades. This statement is true despite the fact that methods for diagnosing malignant lymphoma has changed and misclassification has been a problem. READ MORE

  5. 5. Bioinformatic Analysis of Mutation and Selection in the Vertebrate Non-coding Genome

    Author : Mikael Brandström; Hans Ellegren; Diethard Tautz; Uppsala universitet; []
    Keywords : Biology; non-coding genome; selection; mutation; chicken; human; indel; microsatellite; sequence alignment; comparative genomics; bioinformatics; vertebrate; Biologi;

    Abstract : The majority of the vertebrate genome sequence is not coding for proteins. In recent years, the evolution of this noncoding fraction of the genome has gained interest. These studies have been greatly facilitated by the availability of full genome sequences. READ MORE