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 190 for “"response data"”.
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Marginal Mixture Analysis of Correlated Bounded -Response Data
We illustrate the issues and methodology in the context of an immunogenicity study of measles vaccine for children as well as an ultrasound safety study of the occurrence and extent of lung hemorrhage in laboratory animals due to focused ultrasound exposure.
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Mathematical Modelling and Statistical Inference from Immune Response Data
A hallmark of the adaptive immune response is the proliferation of pathogen-specific lymphocytes that leave in their wake a long lived population of cells that provide lasting immunity. A subject of debate is at which time point post infection those memory cells are produced during an adaptive …
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Least squares estimation for latent variables with dichotomous item response data
… in the statistical models based on item response theory (IRT) was presented in this study. A brief review of existing parameter estimation methods suggested the utility of a parameter estimation method which requires no specific assumption. By re-examining the performance of maximizing …
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Characterization of solar X-ray response data from the REXIS instrument
The REgolith X-ray Imaging Spectrometer (REXIS) is a student-built instrument that was flown on NASA's Origins, Spectral Interpretation, Resource Identification, Safety, Regolith Explorer (OSIRIS-REx) mission. During the primary science observation phase, the REXIS Solar X-ray Monitor (SXM) …
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Characterization of solar X-ray response data from the REXIS instrument
The REgolith X-ray Imaging Spectrometer (REXIS) is a student-built instrument that was flown on NASA's Origins, Spectral Interpretation, Resource Identification, Safety, Regolith Explorer (OSIRIS-REx) mission. During the primary science observation phase, the REXIS Solar X-ray Monitor (SXM) …
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Identifying and Understanding Examinee Behaviors in Item Response Data that Compromise Psychometric Quality
… responder behaviors (e.g., demonstrating response styles, carelessness, and possessing misconceptions) that compromise psychometric quality and impact the interpretation and use of assessment results. Identifying these behaviors can help researchers understand and minimize their …
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A Bayesian statistics approach to updating finite element models with frequency response data
… of updating finite element models with frequency response data acquired in a structural dynamics test. Standard statistical techniques are used to generate statistically qualified data, which is then used in a Bayesian statistics regression formulation to update the finite element model. The …
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Detecting and Quantifying Damage in Buildings Using Earthquake Response Data and Capacity Curves
… capacity curve constructed from actual building response data would be a more realistic representation of the behavior for the building. A method is presented on how capacity curves can be extracted from the response data of a building and how damage can be quantified using the hysteretic …
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New nonparametric statistical procedures for analyzing bias/DIF and dimensionality in item response data
… required by much of the currently used item response theory (IRT) methodologies. In the first part of this thesis, a further and non-trivial practical refinement of DIMTEST(Stout, 1987; Nandakumar & Stout, 1993) is made to assess latent trait unidimensionality for mixed dichotomous and …
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CSADP, a classical control system analysis and design package
… and design tools to experimental frequency response measurements. CSADP allows the user to analyze and manipulate measured frequency response data, design control systems using these measurements, and determine the operational amplifier hardware required to implement the design. To perform …
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Model-robust quantal regression
In the analysis of quantal dose-response data, the most commonly used parametric procedure is logistic regression, commonly referred to as "logit analysis." The adequacy of the fit by the logistic regression curve is tested using the chi-square lack-of-fit test. If the lack-of-fit test is not …
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Statistical analysis of end-points in cancer clinical trials
… clinical trials are reviewed. These are: tumour response, treatment morbidity, survival with related data, and quality of life. A survey of tumour response data from 81 published clinical trials found the most common statistical test in use to be a Chi squared test of the total response rate, but …
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Identifying data conditions to enhance subscale score accuracy based on various psychometric models
… scoring seems to fluctuate under different data conditions. The current study seeks the optimal data conditions for maximizing reliability or accuracy of subscale scores using CTT- and IRT-based methods. Both real-world data and simulation data are used to compute subscale scores, and their …
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An Analysis of Bias Towards Women in Large Language Models Using Likert Scale Evaluations
… bias. The three evaluations used Likert scale response scores, providing quantitative scoring data. Results from evaluation trials were obtained using each LLMs API, collecting Likert scores in response to the evaluation prompts. Free-response data was also collected to understand output …
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Effect of Unequal Sample Sizes on the Power of DIF Detection: An IRT-Based Monte Carlo Study with SIBTEST and Mantel-Haenszel Procedures
… to simulate ability estimates and to generate response data that were analyzed by SIBTEST. The SIBTEST procedure with regression correction was used to calculate the DIF statistics, namely the DIF effect size and the statistical significance of the bias. The older SIBTEST was used to calculate …
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An Experimental and Analytical Investigation of Dynamic Flow Response of a Fan Rotor with Distorted Inlet Flow
… insight and ultimately predict the dynamic flow response of a fan rotor with inlet flow distortion. Rotor exit total pressure circumferential profiles were accurately predicted using frequency response functions derived from experimental rotor response data. Using these predicted profiles, an …
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Implementing a cognitive diagnostic assessment in an institutional test: a new networking model in language testing and experiment with a new psychometric model and task type
… are empirically compared for language test data under a unified general modeling framework. The models are applied to three sets of data, TOEFL Reading, TOEFL Listening and ECPE Grammar and examined in terms of their model fit to the data and functioning. The item-association root mean …
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