Browsing Technical Reports, Department of Statistics by Title
Now showing items 30-39 of 39
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Robust Parameter Design: A Semi-Parametric Approach
(Virginia Tech, 2005)Parameter design or robust parameter design (RPD) is an engineering methodology intended as a cost-effective approach for improving the quality of products and processes. The goal of parameter design is to choose the levels ... -
A Semiparametric Approach to Dual Modeling
(Virginia Tech, 2006)In typical normal theory regression, the assumption of homogeneity of variances is often not appropriate. When heteroscedasticity exists, instead of treating the variances as a nuisance and transforming away the heterogeneity, ... -
A Semiparametric Technique for the Multi-Response Optimization Problem
(Virginia Tech, 2009)Multi-response optimization (MRO) in response surface methodology (RSM) is quite common in applications. Before the optimization phase, appropriate fitted models for each response are required. A common problem is model ... -
Speculations Concerning the First Ultraintelligent Machine
(Virginia Tech, 2005-03-05)The survival of man depends on the early construction of an ultraintelligent machine. In order to design an ultraintelligent machine we need to understand more about the human brain or human thought or both. In the following ... -
Statistical Methods for Degradation Data with Dynamic Covariates Information and an Application to Outdoor Weathering Data
(Virginia Tech, 2012-10-09)Degradation data provide a useful resource for obtaining reliability information for some highly reliable products and systems. In addition to product/system degradation measurements, it is common nowadays to dynamically ... -
Statistical Monitoring of Heteroscedastic Dose-Response Profiles from High-throughput Screening
(Virginia Tech, 2006)In pharmaceutical drug discovery and agricultural crop product discovery, in vivo bioassay experiments are used to identify promising compounds for further research. The reproducibility and accuracy of the bioassay is ... -
Statistical Monitoring of Nonlinear Product and Process Quality Profiles
(Virginia Tech, 2007)In many quality control applications, use of a single (or several distinct) quality characteristic(s) is insufficient to characterize the quality of a produced item. In an increasing number of cases, a response curve ... -
Technical Report on the Evaluation of Median Rank Regression and Maximum Likelihood Estimation Techniques for a Two-Parameter Weibull Distribution
(Virginia Tech, 2008)Practitioners frequently model failure times in reliability analysis via the Weibull distribution. Often risk managers must make decisions after only a few failures. Thus, an important question is how to estimate the ... -
A Test For An Abrupt Change In Weibull Hazard Functions With Staggered Entry And Type I Censoring
(Virginia Tech, 2010)We consider a test of an unknown change-point in a Weibull hazard function. We assume that data are subject to staggered entry and type I censoring. We formulate the profile log-likelihood ratio test statistic as a function ... -
Using a Modified Genetic Algorithm to Find Feasible Regions of a Desirability Function
(Virginia Tech, 2011)The multi-response optimization (MRO) problem in response surface methodology is quite common in applications. Most of the MRO techniques such as the desirability function method by Derringer and Suich are utilized to find ...