Search for dissertations about: "Proportionality assumption"

Showing result 1 - 5 of 6 swedish dissertations containing the words Proportionality assumption.

2. 1. Essays on the Assumption of Proportional Hazards in Cox Regression

   Author : Inger Persson; Kenneth Carling; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Informatics; computer and systems science; Proportional hazards; Cox regression; Proportionality assumption; Informatik; data- och systemvetenskap; Informatics; computer and systems science; Informatik; data- och systemvetenskap; statistik; Statistics;

   Abstract : 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. READ MORE

4. 2. Democracy and the Common Good : A Study of the Weighted Majority Rule

   Author : Katharina Berndt Rasmussen; Gustaf Arrhenius; Folke Tersman; Luc Bovens; Stockholms universitet; []
   Keywords : HUMANIORA; HUMANITIES; Weighted majority rule; common good; collective optimality; well-being; welfare; self-interest; stakes; proportionality; democracy; preference aggregation; Condorcet jury theorem; strategic voting; praktisk filosofi; Practical Philosophy;

   Abstract : In this study I analyse the performance of a democratic decision-making rule: the weighted majority rule. It assigns to each voter a number of votes that is proportional to her stakes in the decision. READ MORE

5. 3. Essays on Econometric Theory

   Author : Peter Jochumzen; Nationalekonomiska institutionen; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; economic theory; econometrics; Economics; measure of fit; unemployment insurance; non proportionality; stochastic frontier production function; diffusion of technology; Duration analysis; economic systems; economic policy; Nationalekonomi; ekonometri; ekonomisk teori; ekonomiska system; ekonomisk politik;

   Abstract : This dissertation contains a variety of contributions to econometric theory. Broadly speaking, econometrics may be categorized depending on what type of data is being analyzed, the two main categories being time series data and cross sectional data. A third category is panel data, combining cross sectional data observed over time. READ MORE

6. 4. Fault detection and model quality estimation using mixed integer linear programming

   Author : Soheil Salehpour; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Reglerteknik; Control Engineering;

   Abstract : Robustness is a necessary property of a control system in an industrial environment, due to changes of the process such as changes of material quality, aging of equipment, replacing of instrument, manual operation (e.g. a valve that is opened or closed) etc. READ MORE

7. 5. On efficient use of censored data and covariate factors in survival analysis and maintenance scheduling

   Author : Ulf Westberg; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kvalitetsteknik; Quality Technology and Management;

   Abstract : This thesis deals with survival analysis and maintenance scheduling, two important issues to achieve efficient use of different production systems. In survival analysis of failure time data, the survival function and the cumulative hazard function are important reliability characteristics. READ MORE