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 11 of 11 for “"Symmetric distribution"”.
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The performance and robustness of confidence intervals for the median of a symmetric distribution constructed assuming sampling from a Cauchy distribution
… means are robust estimators of location for distributions having heavy tails. Theory and simulation indicate that little efficiency is lost under normality when using appropriately trimmed means and that their use with data from distributions with heavy tails can result in improved …
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On some multivariate descriptive statistics based on multivariate signs and ranks
… characterization of the spread of a multivariate distribution of any dimension. We also note bivariate generalization of the boxplot. Since lp-ranks are not affine equivariant, thus scale curves and boxplots based on lp-ranks are not affine equivariant too. Consequently, transformation …
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Bayesian Hidden Markov Models for finding DNA Copy Number Changes from SNP Genotyping Arrays
… measurements are assumed to be stochastic with distribution determined by the underlying DNA copy number. Copy-number-specific distributions, including a non-symmetric distribution for the 0-copy state (homozygous deletions) and mixture distributions for 2-copy state (normal), are developed and …
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Diskriminierung textilrelevanter Tierhaare durch Fourieranalyse zweidimensionaler Oberflächenprofile
… set of four parameters is obtained by fitting a symmetric distribution function to a spectrum which has a logarithmic frequency axis. This function is a mixture of the Gauß- and Lorentz-distribution. The four parameters relate to the height and length of the cuticle scales of the fibres as well …
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Gravitational Lensing and the Maximum Number of Images
… maximum number itself. We study the case of a symmetric distribution of n-1 point-mass lenses at the vertices of a regular polygon of n-1 sides. By the addition of a perturbation in the form of an n-th mass at the center of the polygon it is proven that, as long as the mass is small enough, the …
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A Secure Behavior Modification Sensor System for Physical Activity Improvement
… sensor network could be established through the symmetric distribution of keys (the securing of the infrastructure), and it involves the mathematical analysis of a novel key pre-distribution scheme. Second explores via field testing the "intelligence" level of the system. This was meant to …
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Experimental and Finite Element Evaluation of Mild Traumatic Brain Injury
… the acceleration model demonstrated a more symmetric distribution of energy, especially between Coup and Contrecoup regions, suggesting a localized injury effect.
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CUSUM procedures based on sequential ranks
… signed and unsigned sequential rank CUSUMs are distribution-free and robust against the effect of outliers in the data. The only assumption that these CUSUMs require is that the in-control distribution is symmetric around a known location parameter. These procedures specifically do not require …
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Wind-Induced Exchange in Semi-Enclosed Basins
… influence of the earth's rotation on the lateral distribution of the flow with particular emphasis on the transverse circulation. Along-basin wind-stress with no rotation caused a circulation dominated by an axially symmetric transverse structure consisting of downwind flow over the shoals and …
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A Polynomial Chaos Approach for Stochastic Modeling of Dynamic Wheel-Rail Friction
… distance, and semi-elliptical contact lengths. A symmetric beta distribution is assumed for these six uncertain parameters. The PDF of the CoF has been obtained for each uncertain parameter study, for combinations of two different uncertain parameters, and also for combinations of three different …
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Highly Robust and Efficient Estimators of Multivariate Location and Covariance with Applications to Array Processing and Financial Portfolio Optimization
… they lack statistical efficiency at non-Gaussian distributions, which are common with real-world applications. This dissertation proposes a new tunable S-estimator, termed the Sq-estimator, for the general class of elliptically symmetric distributions—a class containing many common families such …