Sökning: "proportional-hazards"
Visar resultat 1 - 5 av 74 avhandlingar innehållade ordet proportional-hazards.
1. Essays on the Assumption of Proportional Hazards in Cox Regression
Sammanfattning : This thesis consists of four papers about the assumption of proportional hazards for the Cox model in survival analysis. The first paper compares the hazard ratio estimated from the Cox model to an exact calculation of the geometric average of the hazard ratio when the underlying assumption of proportional hazards is false, i.e. LÄS MER
2. The Analysis of Duration and Panel Data in Economics
Sammanfattning : This thesis is divided into two distinct parts. The first part contains three chapters dealing with the analysis of duration data from an econometric perspective and with application to trade durations. LÄS MER
3. Applications of the PEXE-concept for maintenance policies and proportional hazards models
Sammanfattning : .... LÄS MER
4. Cost optimization of maintenance scheduling for wind turbines with aging components
Sammanfattning : A major part of the wind turbine operation cost is resulted from the maintenance of its components. This thesis deals with the theory, algorithms, and applications concerning minimization of the maintenance cost of wind power turbines, using mathematical modelling to find the optimal schedules of preventive maintenance activities for multi-component systems. LÄS MER
5. Prediction-driven decision rules, RCT design and survival analysis
Sammanfattning : Predictions are becoming more and more a part of our lives, and they are becoming increasingly useful in medical science as the science evolves. Increased understanding of disease and its treatments allows us to use predictions based on predictive biomarker signatures to optimize treatment outcomes for increasingly granular subject groups. LÄS MER