Showing papers in "Journal of Quality Technology in 1986"
TL;DR: The capability indices Cp, CPU, CPL, k and Cpk are presented and related to process parameters to form a complementary system of measures of process performance.
Abstract: The capability indices Cp, CPU, CPL, k and Cpk are presented and related to process parameters These indices are shown to form a complementary system of measures of process performance, and can be used with bilateral and unilateral tolerances, with or
1,330 citations
TL;DR: The purpose of this paper is to exposit a control chart technique that may be of value to both manufacturing and continuous process quality control engineers: the exponentially weighted moving average (EWMA) control chart.
Abstract: The Shewhart and CUSUM control chart techniques have found wide application in the manufacturing industries. However, workpiece quality has also been greatly enhanced by rapid and precise individual item measurements and by improvements in automatic dynamic machine control. One consequence is a growing similarity in the control problems faced by the workpiece quality control engineer and his compatriot in the continuous process industries. The purpose of this paper is to exposit a control chart technique that may be of value to both manufacturing and continuous process quality control engineers: the exponentially weighted moving average (EWMA) control chart. The EWMA has its origins in the early work of econometricians, and although its use in quality control has been recognized, it remains a largely neglected tool. The EWMA chart is easy to plot, easy to interpret, and its control limits are easy to obtain. Further, the EWMA leads naturally to an empirical dynamic control equation.
856 citations
TL;DR: The elements of the inspection allocation problem are described and some of the models proposed in the literature are surveyed and possible approaches to the solution of more realistic problems are considered.
Abstract: This paper describes the elements of the inspection allocation problem and surveys some of the models proposed in the literature. The limitations of the existing work are noted and possible approaches to the solution of more realistic problems are menti..
106 citations
TL;DR: In this paper, the statistical performance of control procedures obtained using economic models is often unsatisfactory, and it is shown that statistical performance can be improved by using a CUSUM quality control chart.
Abstract: Recent methods of designing CUSUM quality control charts are reviewed. It is shown that the statistical performance of control procedures obtained using economic models is often unsatisfactory...
89 citations
TL;DR: In this article, the effect of measurement error on the power of a control chart is examined for the case where both the process average and variance can change, and it is shown that if the measurement error i..
Abstract: The effect of measurement error on the power of a control chart is examined for the case where both the process average and variance can change. Expressions for the power of the X-bar and R charts are derived. It is shown that if the measurement error i..
65 citations
TL;DR: Applied Linear Statistical Models 5e uses larger data sets in examples and exercises, and where methods can be automated within software without loss of understanding, it is so done.
Abstract: (1986). Applied Linear Statistical Models. Journal of Quality Technology: Vol. 18, No. 1, pp. 76-77.
62 citations
TL;DR: A computer program to calculate the average run lengths of cumulative sum control charts for controlling normal means is presented in this paper, where the run length of the control chart is calculated using a linear regression model.
Abstract: A computer program to calculate the average run lengths of cumulative sum control charts for controlling normal means is presented.
54 citations
Journal Article•
TL;DR: A computer program to calculate the average run lengths of cumulative sum control charts for controlling normal means is presented in this paper, where the run length of the control charts is calculated using a linear regression model.
Abstract: A computer program to calculate the average run lengths of cumulative sum control charts for controlling normal means is presented...
49 citations
TL;DR: A simple procedure for selecting the optimal economic design of an X-bar control chart for a single assignable cause system is presented that can be applied at the workshop level.
Abstract: A simple procedure for selecting the optimal economic design of an X-bar control chart for a single assignable cause system is presented that can be applied at the workshop level. The procedure has the following features: 1) assuming a constant producti..
46 citations
45 citations
TL;DR: Three-component mixture experiments are very common and Reasons for their popularity are ease in selecting the component combinations to run experiments on, and ease in fitting empirical models to the data collected, as well as interpreting the coeff..
Abstract: Three-component mixture experiments are very common. Reasons for their popularity are: (1) ease in selecting the component combinations to run experiments on, (ii) ease in fitting empirical models to the data collected, as well as interpreting the coeff..
TL;DR: It is common practice to mathematically transform or re-express data (e.g., logs, reciprocals, square roots) to ensure that the assumptions of normal distribution statistics are more closely satisfied as discussed by the authors.
Abstract: It is common practice to mathematically transform or re-express data (e.g., logs, reciprocals, square roots) to ensure that the assumptions of normal distribution statistics are more closely satisfied. Re-expression is a problem in some instances becaus..
TL;DR: It is generally recognized that acceptance sampling by attributes is an important tool for industrial quality control and various models have been proposed that can be used to determine a sampling plan.
Abstract: It is generally recognized that acceptance sampling by attributes is an important tool for industrial quality control. Various models have been proposed that can be used to determine a sampling plan. Some of these, including the one discussed in this pa..
TL;DR: In this paper, the authors presented a table for the selection of single sampling plans for variables using three forms of acceptance criteria (sigma-method, s-method and R-method) which match the Operating Characteristic performance of MIL-STD-105D plans.
Abstract: Tables are given for the selection of single sampling plans for variables using three forms of acceptance criteria (sigma-method, s-method and R-method) which match the Operating Characteristic performance of MIL-STD-105D plans These matched plans are
TL;DR: In this article, a simple method for estimating the percent nonconforming product in accepted lots using a zero defect acceptance sampling plan is proposed, illustrated by a recent application involving the manufacture of an electronic component.
Abstract: A simple method for estimating the percent nonconforming product in accepted lots using a zero defect acceptance sampling plan is proposed. The method is illustrated by a recent application involving the manufacture of an electronic component. Generaliz..
TL;DR: Linear structural models as mentioned in this paper are linear relationships between two stochastic (random) variates in which both of the variates are subject to measurement errors, and are typically fit using least squares.
Abstract: Linear structural models are linear relationships between two stochastic (random) variates in which both of the variates are subject to measurement errors. Structural models are common in experimental work, but are typically fit using least squares. In ..
TL;DR: The authors discusses the effect of measurement errors in both variables when using the simple linear regression model and shows that if the measurement error in x is small, then we can ignore this error and fit the model to data using ordinary linear regression.
Abstract: This paper discusses the effect of measurement errors in both variables when using the simple linear regression model. It is often stated that if the measurement error in x is small, then we can ignore this error and fit the model to data using ordinary..
TL;DR: In this paper, distribution-free one-sided prediction limits are derived for p additional samples based on a preliminary sample, where the probability of all the additional samples meeting a criterion determined from the results of the preliminary sample is expressed in terms o..
Abstract: Distribution-free one-sided prediction limits are derived for p additional samples based on a preliminary sample. The probability of all p additional samples meeting a criterion determined from the results of a preliminary sample is expressed in terms o..
TL;DR: In this paper, simple approximations which are useful for constructing confidence intervals for the parameters, tolerance limits and confidence limits on reliability, based on maximum likelihood estimators, are studied.
Abstract: Simple approximations which are useful for constructing confidence intervals for the parameters, tolerance limits and confidence limits on reliability, based on maximum likelihood estimators, are studied in this paper. A new approximation for the distri..
TL;DR: In this article, operating characteristics for slippage and equi-spaced parametric configurations are studied for selection probabilities and expected subset size, as well as examples for illustrating their use.
Abstract: Operating characteristics are studied for slippage and equi-spaced parametric configurations. Tables and graphs relating to selection probabilities and expected subset size are presented as well as examples for illustrating their use. Also, a new rule i..
TL;DR: The use of sequential uniform residuals is proposed to screen outliers in process control data to control the number of observations incorrectly rejected when the process is in control.
Abstract: The use of sequential uniform residuals is proposed to screen outliers in process control data. The exact distribution theory of these statistics allows a precise control of the number of observations incorrectly rejected when the process is in control ..
TL;DR: In this article, a procedure for controlling a process mean to a target midway between two specified values is presented, assuming that the process variable has a normal distribution with unknown mean and variance.
Abstract: A procedure for controlling a process mean to a target midway between two specified values is presented. It is assumed that the process variable has a normal distribution with unknown mean and variance, and that the data consists solely of counts of the..
TL;DR: In this paper, the binomial double sampling plan was shown to satisfy the following conditions: P(p1) ≥ 1 − αP(p2) ≤ β while minimizing w0ASN(p0) + w1ASN((p1)/αP(1)) + w2ASN (p2)/α(p 2)) ≤ β, where β is the probability of accepting a given sample.
Abstract: A program is presented that finds the binomial double sampling plan satisfying:P(p1) ≥ 1 – αP(p2) ≤ βwhile minimizing w0ASN(p0) + w1ASN(p1) + w2ASN(p2). Here P(p) is the probability of accepting a ...
Journal Article•
TL;DR: In this paper, a modified approach to the computation of control limits for X-bar and R charts is introduced, which consists of replacing X-double bar with the trimmed mean of a subgroup averages, and R-bar with the trimming mean of the subgroup ranges.
Abstract: A modified approach to the computation of control limits for X-bar and R charts is introduced. This procedure consists of replacing X-double bar with the trimmed mean of a subgroup averages, and R-bar with the trimmed mean of the subgroup ranges. Standa..
TL;DR: This paper presents a novel mesoporous composite material for high-performance liquid chromatographyatography that has shown promise in both the high-resolution and the low-tech applications.
Abstract: (This paper was presented at the Journal of Quality Technology Session at the 29th Annual Fall Technical Conference of the Chemical and Process Industries Division of the American Society for Quality Control and Section on Physical and Engineering Scien..
TL;DR: In this article, the authors used the basic distributions established in the first paper to assess the effect of inspection errors in three types of acceptance procedures: double sampling, link sampling, and partial link sampling.
Abstract: This paper, the second in a series, utilizes the basic distributions established in the first paper to assess the effect of inspection errors in three types of acceptance procedures: double sampling, link sampling, and partial link sampling...