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Article
Publication date: 10 July 2020

Bin Nie, Diqing Liu, Xiaohui Liu and Wenjing Ye

The purpose of this paper is to propose a new non-parametric phase I control chart for the problem of non-linear profile outlier detection.

135

Abstract

Purpose

The purpose of this paper is to propose a new non-parametric phase I control chart for the problem of non-linear profile outlier detection.

Design/methodology/approach

The proposed non-parametric method is based on a modified Hausdorff distance, which does not require a restrictive assumption on the form of profiles. By obtaining the distance between each profile and the baseline profile, the authors introduced an iterative optimization clustering algorithm to identify outliers by clustering distances.

Findings

The simulation results show that the proposed method can distinguish outliers for structural changes of non-linear profiles. The authors also present a real industrial case example to highlight how practitioners can implement and make use of the proposed control chart in outlier detection applications, and it achieves higher accuracy in the outlier detection of complex profiles.

Practical implications

The research results of this paper can be applied to any manufacturing or service system whose quality characteristics are characterized by non-linear profiles. This new approach provides quality practitioners a better decision-making tool for non-linear profile outlier detection.

Originality/value

Due to the complexity of real-world applications, the non-linear profiles monitoring problem is yet to be addressed. However, the related research still remains rare. And the authors’ proposed non-linear profile control chart, which does not require a restrictive assumption on the form of profiles, shows its applicability and superiority in simulation study and real-world case.

Details

International Journal of Quality & Reliability Management, vol. 38 no. 2
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 5 March 2018

Hamidreza Izadbakhsh, Rassoul Noorossana and Seyed Taghi Akhavan Niaki

The purpose of this paper is to apply Poisson generalized linear model (PGLM) with log link instead of multinomial logistic regression to monitor multinomial logistic profiles in…

310

Abstract

Purpose

The purpose of this paper is to apply Poisson generalized linear model (PGLM) with log link instead of multinomial logistic regression to monitor multinomial logistic profiles in Phase I. Hence, estimating the coefficients becomes easier and more accurate.

Design/methodology/approach

Simulation technique is used to assess the performance of the proposed algorithm using four different control charts for monitoring.

Findings

The proposed algorithm is faster and more accurate than the previous algorithms. Simulation results also indicate that the likelihood ratio test method is able to detect out-of-control parameters more efficiently.

Originality/value

The PGLM with log link has not been used to monitor multinomial profiles in Phase I.

Details

International Journal of Quality & Reliability Management, vol. 35 no. 3
Type: Research Article
ISSN: 0265-671X

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Article
Publication date: 1 November 1979

B.J. Birch

Many scientists encounter foreign‐language publications whose subjects are of particular relevance to them. Their problem then lies in finding whether a translation is available…

55

Abstract

Many scientists encounter foreign‐language publications whose subjects are of particular relevance to them. Their problem then lies in finding whether a translation is available and if not, where linguistic help may be found. The most useful sources of information about translations have been surveyed with particular emphasis on their strengths and weaknesses, and with examples pertinent to the metals industry. It has been demonstrated that very little effort is required to be 95 per cent certain of the availability, or otherwise, of a translation of a particular paper.

Details

Aslib Proceedings, vol. 31 no. 11
Type: Research Article
ISSN: 0001-253X

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Book part
Publication date: 24 January 2022

Eleonora Pantano and Kim Willems

Traditional sets of attributes characterizing shopping centres need to be updated to relate to new specific consumers' needs and choices, to ensure the survival of shopping…

Abstract

Traditional sets of attributes characterizing shopping centres need to be updated to relate to new specific consumers' needs and choices, to ensure the survival of shopping centres. To this end, this chapter revisits shopping centres’ attributes in the light of consumers' choices of actual centres, taking into account the recent increasing role of technologies, leisure activities and changes in consumer behaviour. In doing so, we aim to improve perceptions of modernity and help to regenerate (or at least mitigate the decline of) shopping centres. Specifically, the new set of attributes include appearance (external appearance), convenience, entertainment and leisure activities, memorable experiences, green place and policy, image (modern image), price, service, size and technology.

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Article
Publication date: 10 February 2012

Simone Pettigrew and Melanie Pescud

The purpose of this paper is to evaluate the ability of a social marketing intervention to provide families with specific nutrition information, stimulate family discussions on…

1037

Abstract

Purpose

The purpose of this paper is to evaluate the ability of a social marketing intervention to provide families with specific nutrition information, stimulate family discussions on the topic of nutrition, and encourage parents to make changes in their child‐feeding practices.

Design/methodology/approach

A postcard intervention was administered to families with children aged five to 12 years at three primary schools in Western Australia. Approximately two months later, an evaluation questionnaire was administered to the three intervention schools and a control school.

Findings

In total, 229 usable questionnaires were returned, representing a 22 percent response rate. In the intervention schools, almost half of the respondents reported discussing the contents of the postcards with their children and a third reported giving the cards to their children to read. The intervention was successful in encouraging a majority (60 percent) of respondents to make at least one favourable change to their child‐feeding practices, in line with the recommendations provided.

Originality/value

The study demonstrated that a simple and cost‐effective social marketing intervention can encourage family discussions on the topic of nutrition and favourably influence parents' child‐feeding practices.

Details

Journal of Social Marketing, vol. 2 no. 1
Type: Research Article
ISSN: 2042-6763

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Article
Publication date: 10 April 2019

Boby John and Vaibhav Agarwal

The purpose of this paper is to demonstrate the application of the control chart procedure to monitor the characteristics whose profile over time resembles a set of connected line…

213

Abstract

Purpose

The purpose of this paper is to demonstrate the application of the control chart procedure to monitor the characteristics whose profile over time resembles a set of connected line segments.

Design/methodology/approach

Fit a regression spline model by taking the subgroup average of the characteristic as response variable and time as the explanatory variable. Then monitor the response variable using the regression spline control chart with the fitted model as center line and upper and lower control limits at three standard deviation units of the response variable above and below the center line.

Findings

The proposed chart is successfully deployed to monitor the daily response time profile of a client server of an application support process. The chart ensured the stability of the process as well as detected the assignable cause leading to the slowing down of the server performance.

Practical implications

The methodology can be used to monitor any characteristics whose performance profile over time resembles a set of connected line segments. Some of the examples are the consumption profile of utility providers like power distribution companies, usage profiles of telecom networks, loading profile of airline check-in process, e-commerce websites, etc.

Originality/value

To the best of the author’s knowledge, construction of control charts using regression spline is new. The usage of the control chart to monitor the performance characteristics which exhibits a nonlinear profile over time is also rare.

Available. Open Access. Open Access
Article
Publication date: 2 March 2023

Sofia Holguin and Olga Kosheleva

Usually, people's interests do not match perfectly. So when several people need to make a joint decision, they need to compromise. The more people one has to coordinate the…

378

Abstract

Purpose

Usually, people's interests do not match perfectly. So when several people need to make a joint decision, they need to compromise. The more people one has to coordinate the decision with, the fewer chances that each person's preferences will be properly taken into account. Therefore, when a large group of people need to make a decision, it is desirable to make sure that this decision can be reached by dividing all the people into small-size groups so that this decision can reach a compromise between the members of each group. The study's objective is to analyze when such a compromise is possible.

Design/methodology/approach

In this paper, the authors use a recent mathematical result about convex sets to analyze this problem and to come up with an optimal size of such groups.

Findings

The authors find the smallest group size for which a joint decision is possible. Specifically, the authors show that in situations where each alternative is characterized by n quantities, it is possible to have a joint decision if the participants are divided into groups of size n -- and, in general, no such decision is possible if the participants are divided into groups of size n -- 1.

Originality/value

The main novelty of this paper is that, first, it formulates the problem, which, to the best of the authors’ knowledge, was never formulated in this way before, and, second, that it provides a solution to this problem.

Details

Asian Journal of Economics and Banking, vol. 7 no. 2
Type: Research Article
ISSN: 2615-9821

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Article
Publication date: 1 March 1982

C.H.A. Fleurent

I could quote many more examples of linguistic difficulties facing the managers, research workers, salesmen and other staff for whom we provide a service. You are all familiar…

90

Abstract

I could quote many more examples of linguistic difficulties facing the managers, research workers, salesmen and other staff for whom we provide a service. You are all familiar with the problem. Some of you cope with it using the resources at your disposal, sometimes scanty, sometimes considerable. Others would like to help their colleagues but are deterred, and I can almost hear them say ‘Am I taking on more than I can cope with? How do I set about it? Can I do it at a time when my budget is limited and it is a struggle to maintain services and standards, let alone embark upon a new venture?’

Details

Aslib Proceedings, vol. 34 no. 3
Type: Research Article
ISSN: 0001-253X

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Article
Publication date: 3 April 2017

Ahmad Hakimi, Amirhossein Amiri and Reza Kamranrad

The purpose of this paper is to develop some robust approaches to estimate the logistic regression profile parameters in order to decrease the effects of outliers on the…

2739

Abstract

Purpose

The purpose of this paper is to develop some robust approaches to estimate the logistic regression profile parameters in order to decrease the effects of outliers on the performance of T2 control chart. In addition, the performance of the non-robust and the proposed robust control charts is evaluated in Phase II.

Design/methodology/approach

In this paper some, robust approaches including weighted maximum likelihood estimation, redescending M-estimator and a combination of these two approaches (WRM) are used to decrease the effects of outliers on estimating the logistic regression parameters as well as the performance of the T2 control chart.

Findings

The results of the simulation studies in both Phases I and II show the better performance of the proposed robust control charts rather than the non-robust control chart for estimating the logistic regression profile parameters and monitoring the logistic regression profiles.

Practical implications

In many practical applications, there are outliers in processes which may affect the estimation of parameters in Phase I and as a result of deteriorate the statistical performance of control charts in Phase II. The methods developed in this paper are effective for decreasing the effect of outliers in both Phases I and II.

Originality/value

This paper considers monitoring the logistic regression profile in Phase I under the presence of outliers. Also, three robust approaches are developed to decrease the effects of outliers on the parameter estimation and monitoring the logistic regression profiles in both Phases I and II.

Details

International Journal of Quality & Reliability Management, vol. 34 no. 4
Type: Research Article
ISSN: 0265-671X

Keywords

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Book part
Publication date: 4 August 2015

Fabiana Moreno and Alex Coad

High-growth firms (HGFs) make a considerable contribution to economic growth, and in recent years they have received increasing interest from entrepreneurship scholars. By…

Abstract

High-growth firms (HGFs) make a considerable contribution to economic growth, and in recent years they have received increasing interest from entrepreneurship scholars. By analysing recent findings in the literature of high-growth firms, this study identifies some Stylized Facts, as well as contradictory findings, and also some unknowns regarding the determinants and internal strategies of HGFs, particularly on the persistence of their superior growth performance and the implications of recent findings for economic policy.

Details

Entrepreneurial Growth: Individual, Firm, and Region
Type: Book
ISBN: 978-1-78560-047-0

Keywords

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