Results 251 to 260 of about 105,471 (295)

A Bivariate Weibull Regression Model

Economic Quality Control, 2005
Summary: We propose a new bivariate Weibull regression model based on censored samples with common covariates. There are some interesting biometrical situations which motivate the study of a bivariate Weibull regression model of the proposed type. A procedure for obtaining the maximum likelihood estimators for the parameters in the model is derived and
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Linear Bayesian Inference for Accelerated Weibull Model

Lifetime Data Analysis, 1997
In this paper, we present a Bayesian approach for inference from accelerated life tests when the underlying life model is Weibull. Our approach is based on the General Linear Models framework of West, Harrison and Migon (1985). We discuss inference for the model and show that computable results can be obtained using linear Bayesian methods.
Mazzuchi, Thomas A., Soyer, Refik, Vopatek, Anne L.   +2 more
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Weibull and inverse Weibull composite distribution for modeling reliability data

Model Assisted Statistics and Applications, 2010
The Weibull distribution, frequently used for life data analysis, is composited with inverse Weibull distribution to obtain a computationally convenient parametric distribution for modeling reliability data. This two-parameter smooth and continuous natural composition has an inverse Weibull density up to an unknown threshold value and Weibull density ...
Cooray, Kahadawala, Gunasekera, Sumith, Ananda, Malwane   +2 more
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Fitting irregular diameter distributions of forest stands by Weibull, modified Weibull, and mixture Weibull models

Journal of Forest Research, 2006
Irregular diameter frequency distributions of forest stands include multimodal structure of mixed-species stands, highly skewed and highly irregular shapes of uneven-aged stands, and rotated sigmoid form of old-growth stands. In this study, a traditional two-parameter Weibull model, a modified two-parameter Weibull model, and a finite mixture of two ...
Lianjun Zhang, Chuangmin Liu
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Strength modeling using Weibull distributions

Journal of Mechanical Science and Technology, 2008
The two-parameter Weibull distribution is the most popular model for material strength. However, it may not be a good model for all materials over a wide range of sizes. In this note, a comprehensive review of the known variations of the two-parameter Weibull distribution is provided to help providing better modeling.
Saralees Nadarajah, Samuel Kotz
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n-fold Weibull multiplicative model

Reliability Engineering & System Safety, 2001
In this paper we study the n-fold multiplicative model involving Weibull distributions and examine some properties of the model. These include the shapes for the density and failure rate functions and the WPP plot. These allow one to decide if a given data set can be adequately modelled by the model.
Jiang, R., Murthy, D. N. P., Ji, P.
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2-acetylaminofluorene and the Weibull model

Food and Cosmetics Toxicology, 1981
Abstract The Weibull model for dose-response functions in carcinogenesis is explored with respect to the results from the large experiment with 2-acetylaminofluorene (2-AAF). Several generalized forms of the Weibull model are presented. Also, the hypothesis of ‘low-dose linearity’ is tested with the data for 2-AAF.
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Fitting Weibull duration models with random effects

Lifetime Data Analysis, 1995
Duration time models often should include correlated failure times, due to clustered data. These random effects hierarchical models sometimes are called "frailty models" when used for survival analyses. The data analyzed here involve such correlations because patient level outcomes (the times until graft failure following kidney transplantation) are ...
Morris, Carl, Christiansen, Cindy
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A modified Weibull model for bacterial inactivation

International Journal of Food Microbiology, 2005
In this paper, a modified Weibull model is proposed to fit microbial survival curves. This model can incorporate shoulder and/or tailing phenomena if they are encountered. We aim to obtain an accurate fit of the "primary" modelling of the bacterial inactivation and to provide a useful and meaningful model for biologists and food industry.
Albert, I, Mafart, P
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WEIBULL MODELING OF THE FENTON'S OXIDATION PROCESS

Journal of Environmental Science and Health, Part A, 2001
A modified version of the two-parameter Weibull survival curve is used to investigate its applicability to analyze the influence of the Fenton's Reagent on the decomposition of 2,4-dinitrophenol solutions (DNP). Fenton's Reagent is one type of advanced oxidation processes (AOPs) in which strong oxidants, hydroxyl radicals, are generated.
Y H, Lin, T H, Wang
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