Sökning: "Keith Humphreys"

Hittade 2 avhandlingar innehållade orden Keith Humphreys.

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. Modelling short and long term consequences of changes in diagnostic activity and treatment

   Författare :Marcus Westerberg; Rolf Larsson; Hans Garmo; Pär Stattin; Keith Humphreys; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mathematics prostate cancer statistics diagnostic activity; Statistics; Statistik; Epidemiologi; Epidemiology; Mathematics with specialization in Applied Mathematics; Matematik med inriktning mot tillämpad matematik;

   Sammanfattning : Since the late 90’s the diagnostic activity for prostate cancer has increased in Sweden, primarily due to increased use of PSA testing, and this has led to a large increase in diagnoses. Simultaneously, there have been changes in treatment strategies, and more effective treatments have been introduced. LÄS MER