Sökning: "observational study"
Visar resultat 11 - 15 av 602 avhandlingar innehållade orden observational study.
11. An Observational Study of Accretion Processes in T Tauri Stars
Sammanfattning : This thesis is a detailed observational study of the accretion processes in T Tauri stars (TTS). The interaction between the central star, the circumstellar disk and the magnetic field gives rise to a wide range of features in the spectra of TTS. LÄS MER
12. Causal Inference in Observational Studies and Experiments: Theory and Applications
Sammanfattning : This thesis consists of six papers that study the design of observational studies and experiments.Paper I proposes strategies to consistently estimate the average treatment effect of the treated using information derived from a large number of pre-treatment measurements of the outcome. LÄS MER
13. The photo-diary and follow-up appointment on the ICU: Giving back the time to patients and relatives. : A descriptive and interventional study
Sammanfattning : Background: Patients on the ICU often spend a great deal of their time either unconscious or heavily sedated. When they return from the zone between life and death they are often in a state of confusion where dreams and delusions are intertwined with reality and it is not always easy to distinguish them apart. LÄS MER
14. How to create and analyze a Heart Failure Registry with emphasis on Anemia and Quality of Life
Sammanfattning : Background and aimsHeart failure (HF) is a major cause of serious morbidity and death in the population and one of the leading medical causes of hospitalization among people older than 60 years. The aim of this thesis was to describe how to create and how to analyze a Heart Failure Registry with emphasis on Anemia and Quality of Life. LÄS MER
15. Some Aspects of Propensity Score-based Estimators for Causal Inference
Sammanfattning : This thesis consists of four papers that are related to commonly used propensity score-based estimators for average causal effects.The first paper starts with the observation that researchers often have access to data containing lots of covariates that are correlated. LÄS MER