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 109 for “"Censoring"”.
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Censoring allegorical texts: interpreting Orwell and Miller
This thesis explores the relationship between censorship and allegory through an analysis of allegorical interpretations of censored texts. The allegorical texts Animal Farm by George Orwell and The Crucible by Arthur Miller are analysed with a view to understanding whether censors of allegory are …
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Modelling gametocytes in the presence of interval-censoring
… observing gametocyte profiles was complex due to censoring. Censoring occurs when an event has not been observed, and hence the event time is only partially known. Censoring occurs for various reasons, which include the following. In some instances, a patient may enter a study with gametocytes …
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30 years of Judy Blume novels... are we still censoring?
<p>Judy Blume has been a target of censors since she started writing novels in the 1970s. Her books have been removed from shelves in school media centers all over the country by either the school board, or even the media specialist. Many studies have been done in the past about censorship and Judy …
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Goodness-of-Fit for Length-Biased Survival Data with Right-Censoring
… to assess the effects of sample size and censoring on the power of the test. Finally, the test is used to evaluate the goodness-of-fit using length-biased survival data of patients with dementia from the Canadian Study of Health and Aging.
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Joint models for nonlinear longitudinal profiles in the presence of informative censoring
… studies are also affected by informative censoring, which leads to incomplete gametocyte profiles. An example of informative censoring is when a patient who experiences treatment failure is “rescued", and withdrawn, from the study in order to receive alternative treatment. This patient can …
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The Censored Heterogeneous Negative Binomial Model
<p>Censoring is an issue common to the analysis of survival data. Survival analysis evaluates time to the occurrence of an event for each individual as its outcome measure; those individuals for whom the event does not occur prior to the end of the study are said to have censored event times. …
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A Comparison of Discrete and Continuous Survival Analysis
… paid attention to three factors of time metrics, censoring proportions, and sample sizes. To arrive at comprehensive understanding of the three factors, the study investigated the separate and combined effect of these factors. Furthermore, to understand the interaction mechanism of those factors, …
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Likelihood-based testing and model selection for hazard functions with unknown change-points
… techniques. While we focus on the cases of no censoring, simple right censoring, and censoring generated by staggered-entry; our derivations reveal that our framework should apply to much broader censoring scenarios.
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Application Of The Empirical Likelihood Method In Proportional Hazards Model
… However, the presence of complicated types of censoring such as double censoring and partly interval-censoring in survival data makes model assessment difficult, and the existing tests for goodness-of-fit do not have direct extension to these complicated types of censored data. In this work, we …
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Nonparametric efficient estimation of prediction error for incomplete data models
… of prediction error in the presence of censoring, <br>generalized non-parametric information bounds are developed. For <br>predictions of survival probabilities that may depend on a vector of <br>covariates, it is proved that inverse probability of censoring <br>weighted estimators are …
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Methods for two-sample comparisons from censored time-to-event data
… bootstrap with a model-based regeneration of censoring indicators. Simulation studies are presented to show that the new SCBs are superior to a currently existing one, in the sense of producing empirical coverage closer to the nominal level. The model-based approach produces tighter and, …
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Semiparametric Regression Under Left-Truncated and Interval-Censored Competing Risks Data and Missing Cause of Failure
… risks data analysis on the CIF include interval censoring, missing event types, and left truncation. Interval censoring occurs when the event time is not observed but is only known to lie between two observation times, such as clinic visits. Left truncation, also known as delayed entry, is the …
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Simulation Comparisons of Semi-Parametric Accelerated Failure Time Model With Different Bandwidths
… model are the most popular models to fit the censoring data. Sometimes, the PH assumption cannot be satisfied, and therefore, the AFT model becomes a useful alternative to the PH model. Comparing with the least square method and the rank estimation method, the profile likelihood method needs …
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Photon-efficient computational imaging with single-photon avalanche diode (SPAD) arrays
… correlated in natural scenes, to perform noise censoring and regularized maximum-likelihood estimation. We expand on this research by adapting the method for use with SPAD arrays, accounting for the spatial non-uniformity of imaging parameters and the effects of crosstalk. We develop statistical …
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Nonparametric Predictive Inference for Multiple Comparisons
… right-censored observations. Different right-censoring schemes discussed are early termination of an experiment, progressive censoring and competing risks. Several selection events of interest are considered including selecting the best group, the subset of best groups, and the subset …
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Comparison of parametric models using right censored data for breast cancer patients
… effect of the treatment given. However, right censoring is often arising when studying the time-to-event data. The data are said to be censored when some individuals are still alive at the end of the study or lost to follow up at a certain time. One of the methods to handle the censored …
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Group Selection in Semiparametric and Nonparametric Accelerated Failure Time Models
… important groups and variables even with high censoring rates. A real data analysis is provided to illustrate the application of the proposed methods. We further study a nonparametric accelerated failure time additive regression (NP-AFT-AR) model whose covariates have nonparametric effects on …
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Citizenship Education and Identity: A comparative study across different schools in Northern Ireland and Israel
… study shows how processes of avoidance and censoring trickle down from the policy level into schools and into classrooms. Third, since citizenship education is permeated by sidestepping and censoring, it is at risk of reproducing the conflict, structural sectarianism and racism, and …
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Using survival analysis to investigate breast cancer in the Kurdistan region of Iraq
… respectively, cases where there is hidden censoring on survival time were investigated. The aim of this study was to identify the main risk factors and quantify the overall risk for breast cancer. We developed a new Markov chain-based method for generating survival curves and hazard …
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