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Showing 1 to 20 of 258 for “"weibull"”.
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Generalized Weibull and Inverse Weibull Distributions with Applications
<p>In this thesis, new classes of Weibull and inverse Weibull distributions including the generalized new modified Weibull (GNMW), gamma-generalized inverse Weibull (GGIW), the weighted proportional inverse Weibull (WPIW) and inverse new modified Weibull (INMW) distributions are introduced. The …
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Weighted Inverse Weibull and Beta-Inverse Weibull Distribution
<p>The weighted inverse Weibull distribution and the beta-inverse Weibull distribution are considered. Theoretical properties of the inverse Weibull model, weighted inverse Weibull distribution including the hazard function, reverse hazard function, moments, moment generating function, coefficient …
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Bayesian Inference of the Weibull-Pareto Distribution
<p>The Weibull distribution has many applications in various topics. Some of these topics include survival analysis, reliability engineering, general insurance, electrical engineering, and industrial engineering. The Weibull distribution was further extended by the Weibull-Pareto distribution. A …
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The Dagum-Weibull and Related Weighted Distributions
… a new class of distributions called the Dagum-Weibull family of distributions is constructed via the \Transform-Transformer" principle. This class of distributions turns out to be a weighted distribution with weights obtained via hazard functions. The class of Dagum-Weibull distributions …
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Inferences on the parameters of the Weibull distribution
… of making inferences about the parameters in the Weibull distribution have been limited to providing simple estimators of the parameters. Little has been known about the properties of the estimators. In this paper the small and moderate sample size properties of the maximum likelihood estimators …
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Statistical Properties of Kumaraswamy Generalized Inverse Weibull Distribution
<p>In this thesis, the generalized inverseWeibull distribution including the proportional reverse hazard and Kumasraswamy generalized inverse Weibull distributions are presented. Properties of these distributions including the behavior of the hazard and reverse hazard functions, moments, coe_cients …
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Generalized Modified Weibull Poisson Distribution with Applications to Lifetime Data
<p>In this thesis, a generalized modified Weibull distribution called the exponentiated modified Weibull Poisson (EMWP) distribution as well as related sub-distributions are proposed. Series expansion of the densities are obtained. Statistical properties of these classes of distributions, including …
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The Generalized Lindley-Weibull Distribution with Applications to Lifetime Data
… of distribution called the generalized Lindley-Weibull distribution for modeling lifetime data is proposed. This model further generalizes the Lindley distribution and allows for hazard rate functions that are monotonically decreasing, monotonically increasing bathtub and upside down bathtub …
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Theoretical Properties and Estimation In Weighted Weibull and Related Distributions
The Weibull distribution is a well known and common distribution. In this thesis, theoretical properties of weighted Weibull distributions are presented. Properties of the non-weighted Weibull distribution are also reiterated for comparison. The probability density functions, cumulative …
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Inference for the survival function of the linearly decreasing stress Weibull
… survivor function or reliability function. The Weibull distribution has long drawn the attention of statisticians for modeling the reliability of systems. In this thesis, making inferences for the survival function of a Weibull system which is exposed to linearly decreasing stress is of concern. …
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Two New Classes of Generalized Modified Weibull Distributions with Application to Lifetime Data
<p>Weibull distribution and its extended families has been widely studied in lifetime applications. Based on the Weibull-G family of distributions and the exponentiated Weibull distribution, we study in detail two new classes of distributions, namely, Gamma-Weibull-G family of distributions (GWG) …
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Weibull mixture model for grouped data and pattern identification in spatial and spatial-temporal data.
… of data. In the first project, we propose the Weibull mixture model to fit the distribution of grain size in continental sediments in geological studies. We use an EM algorithm to fit the model and a bootstrap likelihood ratio test (LRT) to compare different models. The performance of the …
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Bayes and minimum variance unbiased estimators of reliability using the truncated Weibull life testing model
… for the scale parameter θ in the truncated Weibull life testing model when the shape parameter ρ assumed known. In addition, we shall estimate the corresponding reliability function of the above estimators. The first type of estimator of θ and the reliability function we will consider is the …
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Approximate interval estimation methods for the reliability of systems using component data with exponential and Weibull distributions.
… with components whose failure times have a Weibull distribution. A nearly exact parametric lower confidence limit for P(X> x) is developed and evaluated where x is given and X has a normal distribution with unknown mean and variance. This procedure is also simple to evaluate and requires the …
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Cross product ratio under different sampling schemes and zero truncated negative binomial weighted Weibull distribution with applications
… distributions, the negative binomialweighted Weibull and the zero truncated negative binomial-weighted Weibull distributions. Some statistical properties of the proposed distributions are presented. The parameter estimates for the proposed distributions have been derived by the maximum …
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Constraint and Ductile Tearing Effects on the Cleavage Fracture of Ferritic Steel
… steels in terms of KJc (or Jc) values with the Weibull stress model, i.e ., the ""local approach"" for fracture at the micro-scale. The E1921 procedures assume that uniform, small-scale yielding (SSY) conditions exist at fracture along the full crack-front. Plasticity induced constraint loss …
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Effects of oxide film, Fe-rich phase, porosity and their interactions on tensile properties of cast Al-Si-Mg alloys
… the results analysed by Yate’s algorithm and Weibull statistical analysis to determine their relative effects. The most important defect in this research was the oxide film that had an effect on UTS and elongation of about 21 MPa and 0.9% respectively and on the UTS Weibull modulus and …
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