Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 85 for “"Proportional Hazard"”.
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Development of an approach to incorporate proportional hazard modelling into a risk-based inspection methodology for an optimal inspection policy
… methodology consists of incorporating the proportional hazard model (PHM), which is a statistical procedure to estimate the risk of failure for a component subject to condition monitoring, into the risk-based inspection (RBI) methodology so that the PoF estimation can be enhanced to …
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The Influence of Diversity on Government Durations in Parliamentary Systems
… cabinets across 12 countries and applied Cox proportional-hazard modeling to examine the relationships between age and education and the duration of governments in parliamentary systems. The independent variables were age and education level for members of parliamentary governments across …
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The roles of genetics and glycaemic control in the development of LVH and Heart Failure in Type 2 Diabetes
… each of them. Logistic regression analysis and proportional hazard regression analysis were performed to investigate whether glycaemic control was independently related to LVH and HF. Genetic typing for published loci associated with glycaemic control was performed and included in the …
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Sample Size Calculation Based on the Semiparametric Analysis of Short-term and Long-term Hazard Ratios
… sample size formulae for survival data with non-proportional hazard functions under both fixed and contiguous alternatives. Sample size determination has been widely discussed in literature for studies with failure-time endpoints. Many researchers have developed methods with the assumption of …
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Modeling Conversions in Online Advertising
… modeling of response to advertising through a proportional hazard framework.</p> <p>We extend that work and modify the underlying software to allow estimation of voluminous online data sets. We investigate a data visualization technique that allows online advertising histories to be compared …
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Modeling Conversions in Online Advertising
… modeling of response to advertising through a proportional hazard framework.</p> <p>We extend that work and modify the underlying software to allow estimation of voluminous online data sets. We investigate a data visualization technique that allows online advertising histories to be compared …
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Semi-parametric models for response times and response accuracy in computerized testing
… parametric modeling. They are 1. Hierarchical proportional hazard model: This model adopts the hierarchical structure suggested by van der Linden (2007) with the well-known Cox proportional hazard (PH) model in survival analysis. The PH model is comprised of two parts: the non-parametric …
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A Cox proportional hazards-cash flow model for bank failure prediction
This research uses the Cox proportional hazard model and bank cash flow information to determine whether adding cash flow information will improve current bank failure prediction methods. In two published papers it has been shown that the Cox model performs as well as other models with respect to …
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Predictors of Contralateral Breast Cancer In Brca Negative Women
… at between the two groups. Using univariable Cox Proportional Hazard model, thirteen statistically interesting risk factors were found, defined as having a p-value under 0.2. Multivariable stepwise Cox Proportional Hazard model found four statistically significant variables out of the thirteen …
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Natural History and Affecting Factors on Progression of Prehypertension and Prediabetes
… per 1,000 person-year respectively. In the Cox proportional hazard model, changes of CVD risk factors such as abstinence from drink, participating in a regular exercise, and reducing body mass index (BMI) level, and controlling total cholesterol (TC) level played a protective role on progression …
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Approaches for Handling Time-Varying Covariates in Survival Models
… data is very common in medical research. The Cox proportional hazard model is commonly used in analysing time-to-event data. However, this model is based on the proportional hazard (PH) assumption. Violation of this assumption often leads to biased results and inferences. Once non-proportionality …
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The Dagum-Weibull and Related Weighted Distributions
… weighted distribution with weights obtained via hazard functions. The class of Dagum-Weibull distributions contains several submodels such as length-biased Dagum-Weibull (LBDW), proportional hazard moment DagumWeibull (PHMDW), Dagum-Weibull (DW), and Dagum distributions as special cases. Some …
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Survival Model and Estimation for Lung Cancer Patients.
… we assume an exponential form for the baseline hazard function and combine Cox proportional hazard regression for the survival study of a group of lung cancer patients. The covariates in the hazard function are estimated by maximum likelihood estimation following the proportional hazards …
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Serum gamma-glutamyltransferase and the risk of type 2 diabetes in a population-based cohort study of older Mexican Americans
… baseline were evaluated for incident diabetes. Proportional hazard models were used to predict the probability of incident T2D by GGT level.</p> <p>After adjustment for age, gender, smoking, alcohol use, and BMI, the risk of developing T2D associated with GGT was significant at 1.4 (95% CI 1.2 …
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ATTRITION OR RETENTION? EXPLORING 4-YEAR AND 6-YEAR OUTCOMES AMONG NAVY ENLISTED SAILORS
… Kaplan-Meier Survival curve analysis using Cox Proportional Hazard Model to identify predictors of Sailors’ attrition and retention behaviors. Results for 4-year attrition models show that women with either very high (college) or low (GED) educational attainment and Sailors in technical and …
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Determinants of Sports Performance: Case Studies on Olympics & Major League Soccer
… associated with Major League Soccer. A proportional hazard model and a multinomial logit model is used in this estimation to examine the ability of teams to remain competitive, where we explore the factors that assists teams in remaining in specific states of competitiveness.
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Modelling of risk factors, case-fatalities, survival and functional health status for stroke in Kelantan, Malaysia
… for in-hospital stroke fatalities. Using Cox proportional hazard regression, we found that the only two independent prognostic factors for stroke fatality in the hospitals were: a) stroke subtype and b) age. To further investigate the different prognostic effect of stroke subtype on admission …
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Optimal survival trees ensemble
… conditional inference forest, bagging and Cox proportional hazard model. In addition to improved predictive performance, the proposed method also reduces the number of survival trees in the ensemble as compared to the other tree based methods. Furthermore, the method is implemented in an $R$ …
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Empirical study on the motivations of bidders' second tender offer contests
… acquisition activity. Finally, the Cox Proportional Hazard model is estimated to incorporate the time dimension. This model examines the probability of bidders becoming involved in a subsequent acquisition activity in the two years and the five years following their first tender offers. …
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Disparities in Admission and Pediatric Emergency Outcomes by Race, Ethnicity, and Language.
… Generalized estimating equations (GEE) and Cox proportional hazard models were used to assess the association between REaL and patient outcomes. Results: 35,180 patient encounters were analyzed. White patients had significantly higher adjusted odds of hospital admission while Black patients had …
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