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 33 for “"Hazard Models"”.
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Generalized Bathtub Hazard Models for Binary-Transformed Climate Data
<p>In this study, we use a hazard-based modeling as an alternative statistical framework to time series methods as applied to climate data. Data collected from the Kentucky Mesonet will be used to study the distributional properties of the duration of high and low-energy wind events relative to an …
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Extending Space-Time Putative Hazard Models to Detect Latent Risk Features
… modeling and data analysis around putative hazard sources has become a fundamental part of public health and environmental sciences. This dissertation work examines a novel development of three different space-time Bayesian hierarchical modeling methods. </p><p>In Part I, we have addressed a …
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Serum gamma-glutamyltransferase and the risk of type 2 diabetes in a population-based cohort study of older Mexican Americans
… 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 -1.7). …
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Quantifying coseismic land-level change along the Cascadia subduction zone in central Oregon
… rupture dynamics and predicting future seismic hazards. Estimates of the magnitude of coseismic subsidence produced by these great (>M 8.5) earthquakes provide critical constraints for rupture and hazard models. Coastal subsidence from these earthquakes is preserved in tidal wetland …
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Likelihood-based testing and model selection for hazard functions with unknown change-points
… for the existence of change-points in parametric hazard models of various types. Hazard functions and the related survival functions are common units of analysis for survival and reliability modeling. We develop a methodology to test for the alternative of a two-piece hazard against a simpler …
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Disparities in Admission and Pediatric Emergency Outcomes by Race, Ethnicity, and Language.
… 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 significantly …
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Renal and Cardiovascular Outcomes Associated with Cannabis Use in Veterans with Advanced Chronic Kidney Disease Transitioning to Dialysis
… and the incidence of AKI. We used mixed-effects models with random intercepts and slopes and logistic regression to examine the association between UTOX groups and the risk of change in eGFR and AKI, respectively. Chapter 3 describes our investigation of the association between UTOX groups and …
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A dynamic programming approach to the multi-stream replacement problem
… and/or deterministic demand; different hazard models; a budget constraint; repair capacity constraint; various levels of repair; technological improvement; and organizational implementation issues. The operations impact of a generalized methodology for supporting the repair/replace …
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Stratigraphic and microfossil evidence of repeated late Holocene tsunami inundation at Sitkalidak Island, Alaska
Seismic hazard models for Alaska require estimates of the size and frequency of prehistoric megathrust earthquakes. However, observations that place limits on the size of subduction paleoearthquakes along the Alaska-Aleutian subduction zone are scarce. To help place bounds on the along-strike …
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Improved seismic design of structures using risk-targeting and cost-minimization considerations
… are investigated: the one based on uniform-hazard spectra, the risk-targeting technique, and an approach that minimizes the life-cycle costs. While the “uniform-hazard” approach is embedded in most of seismic design regulations, many studies have highlighted the need for a more rigorous and …
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Incidence and determinants of change of initial HAART regimen among outpatient HIV infected adults at the University of Teaching Hospital in Lusaka, Zambia
… regimen and reasons for change. Cox proportional hazard models were performed to analyze factors associated with change of initial HAART regimen. Results: Incidence rate of change and factors associated with change of initial HAART regimen was obtained from 341 medical charts. 154/341 (45.2%) of …
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Impact of Diabetes Comorbidity on Health Outcomes in Patients Undergoing Medical Rehabilitation after Lower Extremity Joint Arthroplasty
… gain was estimated using multivariate regression models. Discharge to acute care (yes/no) after inpatient rehabilitation was compared against discharge to community using multinomial logistic regression. Hospital readmission (yes/no) rates were estimated using Cox regression hazard models. …
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Essays on Welfare Reform and Child Support Enforcement: Evidence From State Administrative Data
… heterogeneity in the caseload, the multivariate hazard models with time-varying covariates and with individual-specific frailty are estimated. The findings suggest that reform accelerated paternity establishment for non-marital children but slowed down the process of obtaining support orders for …
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Modeling Conversions in Online Advertising
… practitioners have developed their own models for predicting purchases. Moreover, online advertising generates an enormous amount of data, long the province of statisticians. My work sits at the intersection of these three areas: marketing, statistics and computer science. Academic …
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Modeling Conversions in Online Advertising
… practitioners have developed their own models for predicting purchases. Moreover, online advertising generates an enormous amount of data, long the province of statisticians. My work sits at the intersection of these three areas: marketing, statistics and computer science. Academic …
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Advancing Rockfall Hazard Assessment through Data-Driven Modelling Based on Laboratory-Scale Experiments
… dynamics of rockfalls is critical for predicting hazards and mitigating risks in both natural and engineered environments. This research investigates the relationship between rock shape, release angle, and rockfall behavior, combining experimental analysis with machine learning (ML) modeling to …
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Urbanization process models, internal rural-urban migration, and the role of institutions in China : three essays on urbanization and migration
… behaviors, and also two Cox proportional hazard models respective to the two survival processes which examine the determinants of such behaviors. Results give rise to an overlapping generational and iterative pattern of the migrants' migration behavior with a filtration mechanism, which I …
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Disaggregated Seismic Hazard and the Elastic Input Energy Spectrum: An Approach to Design Earthquake Selection
… of a probabilistic model of the seismic hazard offers a rational and objective approach that can identify the most likely earthquake scenario(s) contributing to hazard. An ensemble of time series can be selected on the basis of the modal earthquakes derived from the disaggregation. This …
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Impact of Ambient Air Pollution on Survival of Renal Transplant Recipients
… subjects. Time dependent Cox Proportional Hazard models were used to estimate the effect of ambient air pollutants on risk of CHD mortality, while adjusting for potential confounders. For each increase of 10 ppb increase in O<sub>3</sub> the risk of fatal CHD increased by 52% (Relative Risk …
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The role of VEGF-induced PI3K/Akt signalling pathway in head and neck cancer cell migration
… parameters were evaluated with general linear models. Patient characteristics and pAkt IHC score were analysed for possible association with overall survival by Cox proportional hazard models. Immunohistochemistry revealed that cancer patients had significantly higher levels of pAkt T308 than …
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