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 118 for “"model comparison"”.
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Model comparison and assessment by cross validation
Cross validation (CV) is widely used for model assessment and comparison. In this thesis, we first review and compare three v-fold CV strategies: best single CV, repeated and averaged CV and double CV. The mean squared errors of the CV strategies in estimating the best predictive performance are …
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AutoDiff: A Scalable Framework for Automated Model Comparison
… reinforcement learning can cause large language models (LLMs) with identical architectures to exhibit divergent behaviors. However, the mechanisms driving these behavioral shifts remain largely opaque, limiting the reliability and interpretability of adapted models. AutoDiff is a scalable, …
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3D Simulator for Wind Interferometer Data-Model Comparison
… and GPS signals. Thus, predicted & modeling this region is important, yet models (both empirical and first principles) do a poor job of characterizing the variability of this region. One of the main objectives of the NASA ICON mission is to measure the variability of the ionosphere …
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Auditory model comparison and optimization using dynamic time warping
Auditory transduction modeling efforts have relied on detailed metrics such as phase-locking, adaptation time, and spike timings. A technique allowing summary comparison of auditory models is missing from the current body of research. We introduce a new technique based on the dynamic time warping …
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The mental model comparison of expert and novice performance improvement practitioners
… practitioner expert and novice mental models and identify differences and similarities between these models. The secondary purpose was to analyze the potential relationships of the professional profile characteristics of performance improvement practitioners with their mental model of …
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Setting location priors using beamforming improves model comparison in MEG-DCM
Modelling neuronal interactions using a directed network can be used to provide insight into the activity of the brain during experimental tasks. Magnetoencephalography (MEG) allows for the observation of the fast neuronal dynamics necessary to characterize the activity of sources and their …
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Handheld infrared camera use for suicide bomb detection: feasibility of use for thermal model comparison
… presented here determines the feasibility of modeling the heat signature produced by a suicide bomber using thermal models that predict the temperature of the exterior layers of clothing worn. The goal is to be able to compare the images acquired of the suspected bomber to the expected …
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Elementary, pressure dependent model for combustion of C1, C2 and nitrogen containing hydrocarbons : operation of a pilot scale incinerator and model comparison
… present at steady state operations. The kinetic model for the combustion process in the pilot scale incinerator consists of elementary reaction kinetics for oxidation of the model fuel species: CH4, CH3OH, C2H2, C2H4, C2H6 and CH3NH2. Thermodynamic properties for these species are determine by ab …
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Predictive Alternatives in Bayesian Model Selection
Model comparison and hypothesis testing is an integral part of all data analyses. In this thesis, I present two new families of information criteria that can be used to perform model comparison. In Chapter 1, I review the necessary background to motivate the thesis. Of particular interest is the …
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Evaluation of analytical and experimental methods to predict constrained layer damping behavior
… laminate outer layers was investigated for model comparison, sensitivity to design parameters, and evaluation of experimental loss factor estimation techniques. Model comparison for damping estimation and resonant frequency prediction was performed between finite element analysis (FEA) Ross, …
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Investigating the properties of gamma ray bursts and gravitational wave standard sirens as high redshift distance indicators
… commonly faulted for ad hoc assumptions and models with very little discriminating observational evidence, cosmologists are continually trying, and in many cases succeeding, to improve both the data and models. However, the desire to support currently favoured models often dominates research …
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Statistical Analysis of Response Distribution for Dependent Data via Joint Quantile Regression
… methods are not based upon a fully generative model of the data. In this dissertation, we address this difficulty for analyzing spatial point-referenced data and hierarchical data. Several models are introduced by generalizing the joint quantile regression model of Yang and Tokdar (2017) and …
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Adjoint-accelerated Bayesian inference in thermoacoustics
We demonstrate a new approach to thermoacoustic modelling, in which we use an efficient Bayesian inference framework to assimilate experimental data into thermoacoustic models. The framework provides four main tools: (i) parameter inference, (ii) uncertainty quantification, (iii) model comparison, …
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Bayesian analysis for categorical survey data
… categorical survey data. The Multinomial model is used and the following problems are addressed. Limited information about the design variables leads us to model the unknown design variables taking into account the sampling scheme. Random effects are incorporated in the model to deal with …
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Impacts of short-time scale water column variability on broadband high-frequency acoustic wave propagation
… using available acoustic wave propagation models. Three main topics are studied to show that acoustic waves are viable as a remote sensing tool to measure oceanographic parameters in shallow water. First, coherent surface reflections forming striation patterns, from multipath receptions, …
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Tavis Mining Highway Stability Study - Methods Overview and Sensitivity Study
… study of this nature is provided, as well as a model comparison, using limit equilibrium methods, to one of the previous geotechnical studies performed at the mine. Finally, a sensitivity study of highwall stability is performed using finite difference methods.
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Investigation of the 3 x 2 Achievement Goal Framework in Two University Band Contexts: Scale Development and Model Fit of a Six-Factor Structure describing University Band Students’ Goal Orientations Toward Personal and Ensemble Music Performance
… the extent to which the 3 x 2 achievement goal model fits to two contexts of university band performance. Results from a pilot study informed establishment of a 19-item 3 x 2 AGQ – MP. The resulting questionnaire featured matching items with contrasting prompts in order to measure student goal …
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