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Autor:
Richard N. McGrath, Qixuan Chen
Publikováno v:
Quality Engineering. 20:309-320
When addressing quality problems, quality teams are often given a quantifiable goal, requiring data to be assessed in order to determine if the goal has been met. A method is proposed for determining the sample sizes necessary for detecting relative
Publikováno v:
International Journal of Production Research. 46:5679-5699
We propose and study exponentially weighted moving average (EWMA) control charts for monitoring high-yield processes. The EWMA control charts are developed based on non-transformed geometric, binomial and Bernoulli counts. The proposed charts are eva
Publikováno v:
AIDS Care. 19:92-101
Antenatal sero-prevalence rates of 30% and more have been reported in KwaZulu-Natal since 1998 and over 50% of all adult deaths in 2000 were due to AIDS. Understanding the changing social and cultural attitudes to AIDS is important in providing conte
Publikováno v:
HIV Medicine
Objectives Understanding of progression to antiretroviral therapy (ART) eligibility and associated factors remains limited. The objectives of this analysis were to determine the time to ART eligibility and to explore factors associated with disease p
Publikováno v:
Quality Technology & Quantitative Management. 3:415-436
In this paper, we review multivariate control charts designed for monitoring changes in a covariance matrix that have been developed in the last 15 years. The focus is on control charts developed for multivariate normal processes, assuming that indep
Autor:
Arthur B. Yeh, Richard N. McGrath
Publikováno v:
The American Statistician. 59:47-53
The common “F test” for testing the equality of two population variances is very sensitive to the normality assumption, yet many introductory statistics books do not stress this sensitivity. Several alternative dispersion tests have been develope
Autor:
Robert N. McGrath
Publikováno v:
International Journal of Innovation and Technology Management. :341-358
This paper summarizes and interprets several years of research that considered the National Aeronautics and Space Administration's assertion that the Small Aircraft Transportation System (SATS) will become an economical alternative to automobile and
Autor:
Dennis K.J. Lin, Richard N. McGrath
Publikováno v:
Statistics & Probability Letters. 65:369-377
We explore the impact of dispersion effects on location effect estimation and derive approximate joint confidence regions for pairs of correlated location effect estimates. A procedure for estimating location effects in the presence of a single dispe