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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 66 for “"gamma distribution"”.
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Statistical Properties of Weighted Generalized Gamma Distribution
<p>A new class of weighted generalized gamma distribution and related distributions are presented. Theoretical properties of the generalized gamma model, weighted generalized gamma distribution including the hazard function, reverse hazard function, moments, coefficient of variation, coefficient of …
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Parametric quantile regression based on the generalised gamma distribution
… Using the well-known three-parameter generalised gamma distribution to model variation in data, we present a parametric quantile regression study for positive univariate reference charts. The study constitutes an overall package that includes all different stages of parametric modeling starting …
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The gamma distribution as an alternative to the lognormal distribution in environmental applications
… sites the positively skewed lognormal distribution has been the most commonly used model. The upper confidence limit (UCL) of the arithmetic mean of a lognormal population is computed by using the H-statistics. Recent concerns have arisen to the effectiveness of the H-Statistic based …
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Inferences on the shape parameter of the gamma distribution and Cramer-Rao lower bounds from censored data
… procedures on the shape parameter of a gamma distribution from censored sampling. Moments for the statistic T = log(x̅<sub>r</sub>/x͠<sub>r</sub>) are found and used to derive a two-moment chi-square approximation for T. This approximation is then used for testing, estimating, and …
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The Uniform Convergence of Special Standardized Distributions
… uniform convergence of two special standardized distributions are examined. The Gamma distribution is standardized, and then the probability density function of the standardized Gamma distribution is shown to converge uniformly to the probability density function of the normal distribution. The …
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Statistical Methods of Bit Error Rate Estimation in Optical Communication Systems
… of fiber modes at a surface, is modeled by a gamma distribution when a large number of modes are excited in the fiber. However, if a small number of modes are excited, the gamma distribution does not describe the observed noise distribution. A numerical model is presented which describes the …
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Statistical Modelling of Mosquito Abundance and West Nile Virus Risk with Weather Conditions
… In this dissertation, we analyzed the frequency distribution of mosquito surveillance data and built the statistical forecasting models to predict the West Nile virus risk. In the first part, using mosquito data from the surveillance program in Peel Region, Ontario, we studied the distribution …
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Ic-Rest(2): A Time-to-Market Driven IC Reliability Statistics Tool
… statistics are best described by the generalized Gamma-distribution (or more accurately the generalized B-distribution) and on a Gumbel plot look more Weibull than Log-normal .
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Prediction of velocity distribution from the statistics of pore structure in 3D porous media via high-fidelity pore-scale simulation
… the fundamental importance of the velocity distribution in controlling early-time and late-time transport properties (e.g., early breakthrough and superdiffusive spreading), direct relations linking velocity distribution with the statistics of pore structure in 3D porous media have not been …
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Observation and simulation of mid-latitude ice clouds
Knowledge of ice crystal particle size distributions (PSDs) is critical for parameterization schemes for atmospheric models and remote sensing retrieval schemes. In-situ observations are commonly used to obtain PSDs and other cloud microphysical properties. In particular, two-dimensional in situ …
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Inconsistency of Statistical Tests to Discriminate Lifetime Distributions and lines of Indistinguishabilty in Uniform Metric
… success of a particular product. The lifetime distribution method is widely used in the engineering and biomedical applications; In this thesis, I focus on the three most commonly used lifetime distributions: Gamma distribution, Weibull distribution, and Generalized Exponential distribution. …
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Cohort selection and sampling techniques to balance time-series retrospective studies
… with nearest neighbor parameter k=1 and using a Gamma distribution for sampling days produced consistently better class balance than all other methods when bootstrapped over 100 independent runs. We have written, documented and published open source MATLAB code for each selection and sampling …
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A Monte Carlo method for simulation of [pi]° production near threshold
… center of mass frame and subsequently its decay gammas in the lab frame of the reaction. The gamma distribution generated is fitted via the method of maximum likelihood, and the angular distribution parameters are compared to those utilized in the generation process. Due to an ambiguity in the …
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Analysis of surface pressure and velocity fluctuations in the flow over surface-mounted prisms
… surface-mounted prism. The results show that the Gamma distribution provides generally the best statistical description for the pressure time series, and that the method of moments is sufficient for determining its parameters. Additionally, the shape parameter of the Gamma distribution can be …
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Analysis of the Family of Generalized Cumulative Sum Type Control Charts
… to monitor for a change in the parameters of the distribution of a quality measurement. In this project, the family of generalized cumulative sum type charts was studied. An equivalent chart version that requires fewer parameters was given. Some useful integral equations were derived for …
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Application Of Statistical Methods In Risk And Reliability
… of confidence intervals for a cumulative distribution function F(z) and its inverse at some fixed points z and u on the basis of an i.i.d. sample where the sample size is relatively small. The sample is modeled as having the flexible Generalized Gamma distribution with all three parameters …
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Kinetic Analysis of High Affinity Polyclonal Anti-Fluorescyl Immunoglobulin-G Antibodies
… was based on Laplace transformation of the gamma distribution function, which yielded an exact rate law. Kinetic assays were developed for the measurement of both association and dissociation rates. Association rates were measured by following the increase in fluorescence quenching observed …
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Analytical determination of autocorrelation and noise power density spectrum of randomly modulated pulse width square waves
… function for heights of random square wave have Gamma-Distribution Density Function. In addition to this distribution function, we consider the rectangular and Beta-density function on the base of square waves. In fact, the leading edges of most periodic-random base function can be simply …
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Sparse signal representation based algorithms with application to ultrasonic array imaging
… and sparse in nature. Therefore, we use Weibull distribution function with two hyperparameters, namely the shape parameter and the scaling parameter, to model the prior distribution function of the reflectivity coefficients of the reflectors. As we show, the Weibull distribution, whose scale …
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Raindrop Size Distribution Retrieval And Evaluation Using An S-band Radar Profiler
… rain parameters, of which the raindrop size distribution (DSD) is the fundamental quantity used to describe the characteristics of rain. Also, profiler observations during stratiform rain are analyzed to retrieve the corresponding rain DSD’s. In particular, a gamma distribution model is …
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