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.
Results
Showing 1 to 20 of 39 for “"Proportional hazard model"”.
-
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 …
-
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 …
-
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 …
-
Semi-parametric models for response times and response accuracy in computerized testing
… responses. This broadens the scope of potential modeling approaches because response times can be analyzed in addition to analyzing the responses themselves. Current models for response times,however, mainly focus on parametric models that have the advantage of conciseness, but may suffer from a …
-
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 …
-
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 …
-
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.
-
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 …
-
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 …
-
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 $R$ …
-
Empirical study on the motivations of bidders' second tender offer contests
… offer attempt are examined. A multinomial logit model is used to examine the rationales for bidders attempting a second acquisition. The results are consistent with the management entrenchment and the convergence-of-interest hypotheses. Also, a binary logit model is applied to examine the …
-
Pretreatment Serum CYFRA 21-1 Level Correlates Significantly with Survival of Cervical Cancer Patients: A Multivariate Analysis of 506 Cases
… patients. A multivariate analysis using Cox’s proportional hazard model was performed to evaluate the prognostic significance of pretreatment variables. In patients who underwent radical hysterectomy, there was a significant correlation between pretreatment serum SCC-Ag/CYFRA 21-1 levels and …
-
Essays on Industrial Development
… 2015. Employing Poisson regression and the Cox proportional hazard model, it finds that firm efficiency is critical for survival. Technological proficiency lowers exit rates, increases firm longevity, and enhances market retention. The study underscores the necessity of efficiency-driven …
-
Investment Strategies under Uncertainty: Theory and evidence of preemption in case of geographical market entrance
… market entry option. The theoretical model analyses the impact of asymmetries of the competing firms such as follower entry barrier and asymmetric profitability on the optimal market entry timing and firm values. The duopoly model shows the existence of three types of equilibrium …
-
Cheetah (Acinonyx jubatus) mortality and survival in fenced reserves as part of a managed metapopulation across South Africa
… to influence cheetah survival using a Cox proportional hazard model. Predation, mostly by lions (Panthera leo) accounted for 39% of known mortalities. However, the presence of spotted hyena (Crucota crucuta) posed the greatest threat to survival. Contrary to my prediction, translocation …
-
Approaches for Handling Time-Varying Covariates in Survival Models
Survival models are used in analysing time-to-event data. This type of 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 …
-
The Battle Creek Health Study: A retrospective cohort study of the health effects of volatile organic chemicals with individual estimate of exposure based on time-modeling
… in exposure, disease development, and analytical models, while consistency in results was a central theme in the evaluation of the final study results. The exposure assessment consisted of modeling exposure values for individuals retrospectively, estimating when the exposure started, establishing …
-
Comparison of clinical outcome after revascularization versus conservative treatment in patients with borderline fractional flow reserve measurements
… occurred in the PCI group. Using Cox proportional hazard model, there was no difference in lesion-related events between Conservative-group and PCI-group (hazard ratio 0.303, 95% CI 0.5-2.025, P =0.218). CONCLUSIONS: In coronary lesions with borderline FFR, revascularization did not …
-
The Risk of Seizure Recurrence Following a First Unprovoked Seizure in Childhood: An Extended Follow-Up
… by Kaplan-Meier survival analysis and Cox's proportional hazard model. RESULTS: 177 children(43.3%) experienced seizure recurrence. The cumulative risk of recurrence was 28.5%, 38.6%, 46.3%, 51.5%, 53.6% at 6 months, 1, 2, 5, and 8 respectively. The mean duration of seizure recurrence after a …
-
Firm growth, survival and productivity in South Africa
… and specifies a simple logit binary survival model that allows for firm and industry specific characteristics as determinants of survival. The model is improved upon using the non-parametric Kaplan-Meier product limit method and estimating Cox proportional hazard model. The results indicate …
Page 1 of 2