Showing papers in "Journal of Quality Technology in 1969"
TL;DR: Incomplete failure data consisting of times to failure on failed units and differing running times or unfailed units are called multiply censored as discussed by the authors, and data on units operating in the field, for example, are usually multiply censored.
Abstract: Incomplete failure data consisting of times to failure on failed units and differing running times or unfailed units are called multiply censored. Data on units operating in the field, for example, are usually multiply censored. Presented in this paper ..
465 citations
TL;DR: In this paper, linear regression and control chart theory are combined to yield an effective technique for controlling manhours in a situation in which the workload is variable but highly correlated with the manhours.
Abstract: Linear regression and control chart theory are combined to yield an effective technique for controlling manhours in a situation in which the workload is variable but highly correlated with the manhours. Worked examples are discussed in details. Several ..
206 citations
TL;DR: A common rule of thumb is that conventional control limits for X and R charts, no standards given, should be based on at least 25 subgroups as mentioned in this paper, but no standards are given.
Abstract: A common rule of thumb is that conventional control limits for X and R charts, no standards given, should be based on at least 25 subgroups. This article presents information for evaluating the la...
129 citations
Journal Article•
TL;DR: In this paper, the authors evaluate the reliability of X-bar and R chart control limits based on 25 subgroups and present information for evaluating the lack of reliability of these control limits when they a..
Abstract: A common rule of thumb is that conventional control limits for X-bar and R charts, no standards given, should be based on at least 25 subgroups. This article presents information for evaluating the lack of reliability of these control limits when they a..
127 citations
82 citations
TL;DR: In this article, a general procedure is given by which acceptance sampling plans can be quickly and easily obtained from published tables of the binomial, hypergeometric, and Poisson distributions.
Abstract: A general procedure is given by which acceptance sampling plans can be quickly and easily obtained from published tables of the binomial, hypergeometric, and Poisson distributions...
77 citations
TL;DR: Among the various statistical tools of quality control are the organized sets of sampling inspection plans and tables used in the acceptance sampling activities of producers and consumers.
Abstract: Among the various statistical tools of quality control are the organized sets of sampling inspection plans and tables used in the acceptance sampling activities of producers and consumers. Prominent among these are the LTPD, the AOQL, the AQL and the CS..
63 citations
TL;DR: The objective is to provide an introduction to some of the basic concepts of probability theory as they can be used in a program of preventive maintenance.
Abstract: Two basic methods of planning replacements in a program of preventive maintenance are described: (1) age replacement and (2) block replacement. The objective is to provide an introduction to some of the basic concepts of probability theory as they can b..
39 citations
TL;DR: In this article, a simple weighted average of the X-bars with weights n is taken for X-double bars in general, and when n's are small, ranges R are used.
Abstract: When sampling sizes vary, analysis by control charts must be modified from that for equal sample sizes. A simple weighted average of the X-bars, with weights n, is taken for X-double bar in general. Usually when n's are small, ranges R are used. Then to..
37 citations
TL;DR: When separate 100(1-alpha) percent confidence intervals on two population means overlap, the means may or may not be significantly different at the 100-alpha percent level as mentioned in this paper.
Abstract: When separate 100(1-alpha) percent confidence intervals on two population means overlap, the means may or may not be significantly different at the 100-alpha percent level. This phenomenon is explored analytically and numerical examples are given...
35 citations
TL;DR: In this article, the authors present MIL-STD-781B Reliability Tests: Exponential Distribution, a set of tests for exponential distribution of the reliability test set of the MIL STD781B.
Abstract: (1969). MIL-STD-781B Reliability Tests: Exponential Distribution. Journal of Quality Technology: Vol. 1, No. 1, pp. 58-67.
TL;DR: In this article, a review of appropriate univariate procedures for multivariate tests for hypotheses which specify equality of the vectors of means associated with two treatments is given. But the review is limited to the case of two treatments.
Abstract: This second part of a continuing series discusses multivariate tests for hypotheses which specify equality of the vectors of means associated with two treatments. In accord with previous practice, a review of appropriate univariate procedures is given...
TL;DR: The ideas of multivariate analysis are introduced by first associating them with corresponding concepts of univariate analysis, and then illustrating them with simple numerical examples.
Abstract: The ideas of multivariate analysis are introduced by first associating them with corresponding concepts of univariate analysis, and then illustrating them with simple numerical examples. A tutorial appendix is included which deals with the properties an..
TL;DR: In this article, an interval within which the next observation from a normal population can be expected to lie is constructed and contrasted with a confidence interval and a tolerance interval, where the confidence interval is defined as the probability that the observation will lie.
Abstract: An interval within which the next observation from a normal population can be expected to lie is constructed and contrasted with a confidence interval and a tolerance interval
TL;DR: A detailed discussion of the classical sign test is given in this paper, with assumptions and conditions of use for fixed sample sizes, and the relationship of this to other (frequently, but not always) more powerful tests of the same or similar nature.
Abstract: A detailed discussion of the classical sign test is given. Assumptions and conditions of use are described and illustrated for fixed sample sizes. The relationship of this to other (frequently, but not always) more powerful tests of the same or similar ..
TL;DR: The use of residual analysis prior to the performance of statistical tests upon experimental data is recommended as a routine procedure as discussed by the authors, and the calculation of residuals from data resulting from a variety of experimental designs is described.
Abstract: The use of a residual analysis prior to the performance of statistical tests upon experimental data is recommended as a routine procedure This paper describes (a) the calculation of residuals from data resulting from a variety of experimental designs;
TL;DR: The extent to which the cumulative sum chart and other devices are used in statistical quality control and the fact that this is still the appropriate view when control is of concern is reminded.
Abstract: Readers are reminded of Shewhart's original meaning of the phrase "statistical quality control" and the fact that this is still the appropriate view when control is of concern The extent to which the cumulative sum chart and other devices are
TL;DR: The Thesaurus of Engineering and Scientific Terms as discussed by the authors is a collection of terms used in engineering and scientific terms that are related to the one we use here, but not related to this paper.
Abstract: (1969). Thesaurus of Engineering and Scientific Terms. Journal of Quality Technology: Vol. 1, No. 2, pp. 154-154.
TL;DR: In this paper, a chart is presented which will greatly simplify the application of the switching rules in MIL-STD-105D, which is the case of the switch rules used in this paper.
Abstract: A chart is presented which will greatly simplify the application of the switching rules in MIL-STD-105D...
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TL;DR: The Latin square, a design for investigating three factors all at the same number of levels, is discussed in this article, where applications, selection, mathematical model, analysis and replication are presented in detail.
Abstract: The Latin square, a design for investigating three factors all at the same number of levels, is discussed. Applications, selection, mathematical model, analysis and replication are presented in detail. Information on interactions in Latin squares and an..
TL;DR: In this paper, the authors present a table that minimizes the number of tests required when testing is done in groups and only two out of three out of four out of the test cases are tested in each group.
Abstract: Groups of items must sometimes be screened so that each item in the group can be identified as either good or defective. The accompanying tables will minimize (on the average) the number of tests required when testing is done in groups and only two outc..
TL;DR: A statistical design for the investigation of the effects of several reagents and catalysts on production rate is used to illustrate how information additional to that planned for can be extracted from the data.
Abstract: A statistical design for the investigation of the effects of several reagents and catalysts on production rate is used to illustrate how information additional to that planned for can be extracted from the data...
TL;DR: In this paper, the use of order statistic quantiles in testi cation has been discussed and an example of such a paper for the normal family of distributions is given for the case of order statistics.
Abstract: Conventional probability plotting paper can be readily augmented to permit graphical determination of quantiles for order statistics. An example of such paper is given for the normal family of distributions. The use of order statistic quantiles in testi..
TL;DR: In this article, the authors present MIL-STD-471, Maintainability Demonstration, which is used to demonstrate the maintainability of a vehicle in the field of quality assurance.
Abstract: (1975). MIL-STD-471, Maintainability Demonstration. Journal of Quality Technology: Vol. 7, Standards and Specifications, pp. 109-123.
Journal Article•
TL;DR: In this article, the failure rate sampling plans and procedures for failure detection in MIL-STD-690B were discussed. But they did not consider failure detection with a single sample.
Abstract: (1969). MIL-STD-690B, Failure Rate Sampling Plans and Procedures. Journal of Quality Technology: Vol. 1, No. 3, pp. 205-216.
TL;DR: In this article, the authors proposed plotting c-and u-charts to plot the c- and u-Charts of the CQT system, and they used the u-chart as a basis for the plotting of c-texts.
Abstract: (1969). Plotting c- and u-Charts. Journal of Quality Technology: Vol. 1, No. 4, pp. 285-288.
TL;DR: In a continuation of the elements of multivariate analysis, this installment is devoted to multivariate extensions of the analysis of variance, such as the likelihood ratio test of Wilks and the union-intersection test of Roy.
Abstract: In a continuation of the elements of multivariate analysis, this installment is devoted to multivariate extensions of the analysis of variance. The likelihood ratio test of Wilks and the union-intersection test of Roy are introduced...