Search Results - isPartOf:"Economic Quality Control"

Selection of Mixed Sampling Plans for Second Quality Lots

Deva, Arul S.; Jemmy, Joyce V. - In: Economic Quality Control 25 (2010) 1, pp. 31-42

In this paper mixed sampling plans for acceptance sampling of second quality lots are proposed. Mixed sampling plans combine process control and lot control aiming at increasing the reliability and/or the efficiency of acceptance sampling plans. The process control part refers to a measurable...

Persistent link: https://www.econbiz.de/10010736169

Designing Single Sampling Plans by Variables Using Predictive Distribution

Loganathan A.; Vijayaraghavan R.; Rajagopal K. - In: Economic Quality Control 25 (2010) 2, pp. 301-316

Sampling plans by variables represent a well-known tool of acceptance sampling and often it is said that their sampling efficiency/economy is better than that of sampling plans by attributes. However, a comparison of the two types of sampling plans is questionable, because the underlying aims...

Persistent link: https://www.econbiz.de/10010736170

On Testing Exponentiality Against DMRL Alternatives

Anis Mohammed Z. - In: Economic Quality Control 25 (2010) 2, pp. 281-299

A new test statistic for testing exponentiality against DMRL property of life distributions is introduced in this paper. Critical values are tabulated for small and moderate sample sizes based on Monte Carlo simulation. Two sets of real data are used as examples to elucidate the use of the...

Persistent link: https://www.econbiz.de/10010736180

On the Robustness of Reliability Characteristic of Alpha-Distributed Lifetimes

Khan Maroof A.; Islam H. M. - In: Economic Quality Control 25 (2010) 2, pp. 173-181

This paper considers the analysis of reliability characteristics of an alpha distributed lifetime assuming that its parameters are subjected to random variations.

Persistent link: https://www.econbiz.de/10010736195

Acceptance Sampling Plans from Truncated Life Tests Based on the Log-Logistic Distributions for Percentiles

Srinivasa, Rao G.; Kantam R. R. L. - In: Economic Quality Control 25 (2010) 2, pp. 153-167

In this article, acceptance sampling plans are developed for the log-logistic distribution percentiles when the life test is truncated at a pre-specified time. The minimum sample size necessary to ensure the specified life percentile is obtained under a given customer's risk. The operating...

Persistent link: https://www.econbiz.de/10010736214

Median Inactivity Time Function and its Reliability Properties

Mohamed, Kandil Abd El-Fattah; Ramadan, Mahdy Mervat Mahdy - In: Economic Quality Control 25 (2010) 2, pp. 253-268

Let the non-negative random variable X denote the life time of a unit, then the random variable X (t) = t – X for X ≤ t for a fixed t ∈ {x : FX (x) 0}, is known as inactivity time or reversed residual life time. In this paper, we define a new non-parametric class of life distributions...

Persistent link: https://www.econbiz.de/10011015794

Optimal Replacement Policy Based on the Number of Down Times with Priority in Use

Hanagal David D.; Kanade Rupali A. - In: Economic Quality Control 25 (2010) 2, pp. 243-251

This paper is an extension of the paper “Optimal Replacement Policy Based on Number of Down Times” of the authors, which was published in EQC 25/1. While the former investigated a cold standby system consisting of two identical components, the present one considers the same situation,...

Persistent link: https://www.econbiz.de/10011015812

On New Perspectives for Statistical Computing in Business and Industry – A Solution with STATISTICA and R

Weiß Christian H. - In: Economic Quality Control 25 (2010) 1, pp. 43-64

Companies in business and industry often make very different demands on statistical software packages, like flexibility concerning customized solutions, possibility of integrating non-standard stochastic approaches, use to validated applications, user-friendly interface, moderate costs, and many...

Persistent link: https://www.econbiz.de/10011015822

An L-Banded Approximation to the Inverse of Symmetric Toeplitz Matrices

Romain, Benassi; Antonio, Pievatolo; Rainer, Göb - In: Economic Quality Control 25 (2010) 1, pp. 13-30

We apply the banded matrix inversion theorem given by Kavcic and Moura [IEEE Trans. Inf. Theory 46: 1495–1509, 2000] to symmetric Toeplitz matrices. If the inverse is banded with bandwidth smaller than its size, there is a gain in arithmetic complexity compared to the current methods for...

Persistent link: https://www.econbiz.de/10011015826

An Addendum to the Estimators of Murthy–Sarma and Anis–Pandey of the Mean of the Normal Distribution

Singh Housila P.; Mujahida, Sayyed - In: Economic Quality Control 25 (2010) 1, pp. 97-107

Anis and Pandey [Economic Quality Control 18: 83–90, 2003] have pointed out that the bias and mean squared error … 12: 1–5, 1998] and Anis and Pandey [Economic Quality Control 18: 83–90, 2003] are found incorrect for small samples. In … Quality Control 18: 83–90, 2003] have derived an alternative expression for the mean squared error (MSE) of one of the …

Persistent link: https://www.econbiz.de/10011015858