An Approach for quality control chart appropriateness evaluation based on desirability functions

Tunç, Sıdıka
Quality control charts are among the oldest and most powerful tools in statistical process control. Several control charts have been developed for specific needs and characteristics of processes. However, their proper implementation requires expert knowledge about statistics and properties of these charts. In this study, an effective approach is developed to evaluate appropriateness of control charts for the process to be monitored and the process owner. This approach can be used to recommend the most appropriate control chart to a novice process owner. The chart evaluation problem is formulated as a multi-criteria decision making problem, and desirability functions are utilized for its solution. The evaluation criteria are identified and the desirability functions are constructed based on knowledge from literature and experts. The approach is developed and tested for commonly used X̄-R, X̄-S, I-MR, I-MR-R and Exponentially Weighted Moving Average (EWMA) variable control charts; and its parameters are fine-tuned by statistical experimentation and optimization.


Monitoring reliability for a three-parameter Weibull distribution
Sürücü, Barış (Elsevier BV, 2009-02-01)
Control charts are widely used to monitor production processes in the manufacturing industry and are also useful for monitoring reliability. A method to monitor reliability has recently been proposed when the distributions of inter-failure times are exponential and Weibull with known parameters. This method has also been extended to monitor the cumulative time elapsed between a fixed number of failures for the exponential distribution. In this paper, we consider a three-parameter Weibull distribution to mod...
A framework for information quality and coverageassessment for type 2 diabetes websites
Ölçer, Didem; Taşkaya Temizel, Tuğba; Department of Information Systems (2020-10-22)
Health information seekers often use search engines to access high-quality and up-to-date information. However, finding online high-quality health information is increasingly getting difficult due to the high volume of information generated by non-experts in the area. There are manual tools which help end-users in assessing the quality of websites. However, they are labour-intensive. This thesis aims to propose a framework that automatically evaluates the content coverage and quality of health websites acco...
A balanced scorecard model for the performance measurement of enterprise resource planning imlementation
Arık, Ayşe Gül; Onay, Lamia Zeynep; Department of Business Administration (2006)
In this study, the applicability of the Balanced Scorecard Framework, developed by Robert S. Kaplan and David P. Norton in 1992 for measuring performance at the organizational level or the business unit level, to performance measurement during the implementation phase of Enterprise Resource Planning (ERP) systems is investigated. A model based on the Balanced Scorecard Framework is presented with sample indicators for each of the four perspectives -Financial Perspective, Customer Perspective, Internal Busin...
A new approach to mathematical water quality modeling in reservoirs: Neural networks
Karul, C; Soyupak, S; Germen, E (1998-01-01)
Neural Networks are becoming more and more valuable tools for system modeling and function approximation as computing power of microcomputers increase. Modeling of complex ecological systems such as reservoir limnology is very difficult since the ecological interactions within a reservoir are difficult to define mathematically and are usually system specific. To illustrate the potential use of Neural Networks in ecological modeling, a software was developed to train the data from Keban Dam Reservoir by back...
Robust control charts
Çetinyürek, Aysun; Sürücü, Barış; Department of Statistics (2006)
Control charts are one of the most commonly used tools in statistical process control. A prominent feature of the statistical process control is the Shewhart control chart that depends on the assumption of normality. However, violations of underlying normality assumption are common in practice. For this reason, control charts for symmetric distributions for both long- and short-tailed distributions are constructed by using least squares estimators and the robust estimators -modified maximum likelihood, trim...
Citation Formats
S. Tunç, “An Approach for quality control chart appropriateness evaluation based on desirability functions,” M.S. - Master of Science, Middle East Technical University, 2016.