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A. Erhan Mergen, Ph.D.

Professor, Zutes Fellow

Office Location: LOW-2329

Office Phone: 585-475-6143

Fax: 585-475-5975

Email:
emergen@saunders.rit.edu

Decision Sciences
Program Info. | Faculty List

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Meet A. Erhan

A. Erhan Mergen is a professor of Decision Sciences. He holds a Ph.D. in Administrative and Engineering Systems; M. Sc. in Industrial Administration; and a B.Sc. in Management. Dr. Mergen's main interest is in statistical quality control and application of quantitative techniques to production and operations management. He teaches graduate and undergraduate courses in quality control, operations management, and quantitative methods. He has published many articles and presented papers in academic and professional meetings in the area of statistical quality control (SQC). His papers have appeared in journals such as the Journal of Applied Statistics, Quality and Reliability Engineering, Quality Engineering, Quality, Total Quality Management, Simulation and Gaming. He has also served as a referee for Quality and Reliability Engineering; Management Science; and The American Statistician journals. He is a member of the American Society for Quality (ASQ - formerly ASQC); Beta Gamma Sigma, The National Scholastic Honorary Society; Sigma Xi, The Scientific Research Society; and the International Institute of Forecasters. He is also a member of editorial board of the Total Quality Management & Business Excellence journal and served on the editorial board of the Quality Engineering journal for fourteen years (1999-2013). Between 1982-1984, prior to joining RIT, Dr. Mergen also conducted seminars on SQC for private and public industrial groups overseas, sponsored by the United Nations Industrial Development Organization. He is periodically involved in SQC consulting and training seminars through Stochos, Inc., a consulting firm located in Duanesburg, N.Y.


Office Hours & Staff Assistant Information


Staff Assistant: Sarah Geiss
Staff Assistant Phone: 585-475-6057
Education
  • Ph.D. in Administrative and Engineering Systems from Union College, 1981
  • M.S. in Industrial Administration from Union College, Schenectady, NY, 1978
  • B.S. in Management from Middle East Technical University, Ankara, Tur, 1975
Experience
  • Professor | Rochester Institute of Technology | 1984-Present
  • Assistant Professor, Dept. of Management | Middle East Technical University | 1982-1984
  • Consultant in quality control projects | Stochos, Inc. | 1984-1984
  • Instructor, Dept. of Management | Middle East Technical University | 1981-1982
  • Market Analyst. | Fenni Gama, Domestic and International Trade | 1975-1976
Expertise [expertise maps]
  • Operations management
  • Quality control
Memberships
  • Sigma Xi, The Scientific Research Society
  • National Association of Purchasing Management
  • Member of the Turkish Statistical Association
  • Member of the editorial board of theTotal Qua
  • Member of the editorial board of the Quality
  • International Institute of Forecasters
  • Beta Gamma Sigma Honorary Society
  • American Society for Quality
Awards
  • Saunders College of Business - - 2017
  • Saunders College of Business - - 2016
  • the Total Quality Management and Business Excellence Journal - - 2015
  • Induction to Beta Gamma Sigma, Beta Gamma Sigma - - 1989
  • RIT Special Services Award, RIT - - 1988
Research

Journal Articles

  • Uysal, M., & Mergen, A. (2017). "An Enterprise Architecture For Software Re-Engineering: A Model-Driven and Ontology-Based Approach,". Journal of Science and Engineering, 19 (55.1 (Special issue)), 24-42.
  • Holmes, D., & Mergen, A. (2016). An Alternative Test for Randomness of Error Terms in a Regression Model. Quality Digest .
  • Stevenson, W., & Mergen, A. (2014). Estimating Seasonal Relatives Using Simple Averaging: Not Just for Stationary Data. Operations Management Education Review , 125-138.
  • Holmes, D., & Mergen, A. (2014). Converting Survey Results from 4-Point to 5-Point Scale. Total Quality Management and Business Excellence, 25 (2), 175-182.
  • Holmes, D., & Mergen, A. (2011). Analysis of the Use of Ratios for Process Management and Decision-Making. Total Quality Management and Business Excellence, 22 (7), 787-794.
  • Holmes, D., & Mergen, A. (2011). Using SPC in Conjunction with APC. Quality Engineering, 23 (4), 360-364.
  • Mergen, A., & Deligonul, S. (2010). Assessment of Acceptance Sampling Plans Using Posterior Distribution for a Dependent Process. Journal of Applied Statistics, 37 (2), 299-307.
  • Grant, D., & Mergen, A. (2009). Towards the Use of Six Sigma in Software Development. Total Quality Management and Business Excellence, 20 (7), 705-712.
  • Mergen, A., & Stevenson, W. (2009). Can't Fix Service Quality? Read This. Total Quality Management and Business Excellence, 20 (6), 681-686.
  • Aybar, B., Mergen, A., Perotti, V., & Reid, D. (2007). Analysis of Attitudes of Turkish Citizens Towards the Effect of European Union Membership on the Economic, Political, and Cultural Environment. Turkish Studies, 8 (3), 329-348.
  • Holmes, D., & Mergen, A. (2006). Identifying Need for New Factors in EVOP. Quality Engineering, 18 (2), 219 - 224.
  • Stevenson, W., & Mergen, E. (2006). Teaching Six Sigma Concepts in a Business School Curriculum. Total Quality Management and Business Excellence, 17 (6), 751-56.
  • Holmes, D., & Mergen, A. (2005). Effect of Multivariate Process Instability on Principal Component Analysis - A Case Study,. The AAPS Journal, 7 (1), 106 - 117.
  • Grant, D., Mergen, A., & Widrick, S. (2004). A Comparative Analysis of Quality Management in US and International Universities. Total Quality Management .
  • Holmes, D., & Mergen, A. (2004). A Multivariate Subgroup Rationality Test. Quality Engineering, 16 (4), 657-662.
  • Mergen, A., & Bear, M. (2003). A Supplemental Approach to Analyzing Trade Data. Istatistik, Journal of the Turkish Statistical Association, 5 (1), 28-39.
  • Levinson, W., Holmes, D., & Mergen, A. (2002). Variation Charts for Multivariate Processes. Quality Engineering, 14 (4), 539-545.
  • Widrick, S., Mergen, A., & Grant, D. (2002). Measuring the Dimensions of Quality in Higher Education. Total Quality Management, 13 (1), 123-131.
  • Grant, D., Mergen, A., & Widrick, S. (2002). Quality Management in U.S. Higher Education. Total Quality Management, 13 (2), 207-215.
  • Mergen, A., & Stevenson, W. (2002). Sowing the Seeds of Quality: Quality at the Source. Total Quality Management, 13 (7), 1015-1020.
  • Holmes, D., & Mergen, A. (2001). A Tool to Monitor Processes. Istatistik, Journal of the Turkish Statistical Association, 3 (1&2), 21-28.
  • Holmes, D., & Mergen, A. (2001). Measuring Process Performance for Multiple Variables-Revisited. Quality Engineering, 13 (4), 661-665.
  • Holmes, D., & Mergen, A. (2000). Process Performance Measures When Process Distribution is Non-Normal. Istatistik, Journal of the Turkish Statistical Association, 2 (3), 165-174.
  • Holmes, D., & Mergen, A. (2000). EWMA Acceptance Charts. Quality and Reliability Engineering International, 16 (2), 1-4.
  • Holmes, D., & Mergen, A. (2000). Building and Acceptance Chart. Quality Digest, 20 (6), 35-36.
  • Mergen, A., Grant, D., & Widrick, S. (2000). Quality Management Applied to Higher Education. Total Quality Management, 11 (3), 345-352.
  • Holmes, D., & Mergen, A. (1999). Measuring Process Performance for Multiple Variables. Quality Engineering, 11 (1), 55.
  • Wen, D., & Mergen, A. (1999). Running a Process with Poor Capability. Quality Engineering, 11 (4), 505-509.
  • Holmes, D., & Mergen, A. (1998). Multivariate Test For Randomness. Quality Engineering, 10 (3), 505.
  • Mergen, A., & Holmes, D. (1998). Lot Quality Distribution for Autocorrelated Data. Istatistik, Journal of the Turkish Statistical Association, 1 (1), 43.
  • Holmes, D., & Mergen, A. (1997). Process Acceptance Charts for Short Runs. Quality Engineering, 10 (1), 149.
  • Grant, D., & Mergen, A. (1996). Applying Quality to Leavitt's Framework to solve Information Technology Problems: A Case Study. Information Technology and People, 9 (2), 47.
  • Holmes, D., & Mergen, A. (1995). An Alternative Method to Test for Randomness of a Process. Quality and Reliability Engineering International, 11 (3), 171.
  • Holmes, D., & Mergen, A. (1995). Identifying the Sources for Out-of-control Signals When T2 Control Chart is Used. Quality Engineering, 8 (1), 137.
  • Mergen, A. (1994). Total Quality Management. Journal of Economics and Administrative Sciences, 11 (1&2), 25.
  • Holmes, D., & Mergen, A. (1993). Improving the Performance of T-square Control Chart. Quality Engineering, 5 (4), 619.
  • Holmes, D., & Mergen, A. (1992). Parabolic Control Limits for the Exponentially Weighted Moving Average Control Chart. Quality Engineering, 4 (4), 487.
  • Mergen, A., & Pray, T. (1992). Modeling Total Quality Elements into a Strategy-Oriented Simulation. Simulation & Gaming, 23 (3), 277.
  • Holmes, D., & Mergen, A. (1991). A Discussion of the Unit of Calibration Required for a Gauge. Quality Engineering, 4 (1), 1.
  • Holmes, D., & Mergen, A. (1990). The Dynamic Histogram Chart. Quality and Reliability Engineering International, 6 (2), 107.
  • Holmes, D., & Mergen, A. (1989). Testing Control Chart Subgroups for Rationality. Quality and Reliability Engineering International, 5 (2), 143.
  • Holmes, D., & Mergen, A. (1988). A Managerial Tool for Process Capability Analysis. Quality and Reliability Engineering International, 4 (1), 63.
  • Holmes, D., & Mergen, A. (1988). Proper Subgroup Size for Statistical Process Control. Quality and Reliability Engineering International, 4 (4), 339.
  • Deligonul, Z., & Mergen, A. (1987). Dependence Bias in Conventional p-Charts and its Correction with an Approximate Lot Quality Distribution. Journal of Applied Statistics, 14 (1), 75.
  • Holmes, D., & Mergen, A. (1987). A Good Tool for Process Control: The Cumulative Sum Chart. Quality , 71.
  • Holmes, D., & Mergen, A. (1986). Chi-Square vs. X-bar and R Chart. Quality , 60.
  • Mergen, A. (1982). Dependence v.s. Independence Assumptions in Statistical Quality Control,. Middle East Technical University Studies in Development , 55-67.

Proceedings

  • Holmes, D., & Mergen, A. (2017). Process Capability Analysis for Variables with One-Sided Specification Limit and No Nominal Value. The 2017 Northeast Decision Sciences Institute Meeting Proceedings, Springfield, MA, March 23-25, 2017, 670-674.
  • Holmes, D., & Mergen, A. (2016). Are Your Process variables Six Sigma Capable?. The 2016 North East Decision Sciences Meeting Proceedings, Alexandria, VA.
  • Uysal, M., & Mergen, A. (2015). Quality Oriented and Model Based Software Re-engineering Process. Proceedings of the 9th Turkish National Software Engineering Symposium.
  • Holmes, D., & Mergen, A. (2015). Capability Indices When There is a Steady Shift in the Process Average. The 2015 Northeast Decision Sciences Institute Meeting Proceedings, Cambridge, MA.
  • Holmes, D., & Mergen, A. (2014). A First Order Markov Chain Model for Autocorrelated Processes. The 2014 Northeast Decision Sciences Institute Meeting Proceedings, Philadelphia, PA, 995-1000.
  • Uysal, M., & Mergen, A. (2013). "A Quality-Oriented Approach to Software Reengineering". The 2013 Northeast Decision Sciences Institute Meeting Proceedings, Brooklyn, NY, 971-979.
  • Holmes, D., & Mergen, A. (2012). Control Limits versus Acceptance Limits: Which Limits are Appropriate for Your Task?. The 2012 Northeast Decision Sciences Institute Meeting Proceedings, Newport, RI, 415-421.
  • Holmes, D., & Mergen, A. (2011). Discussion of Parabolic Mask for Cumulative Sum Control Charts. The North East Decision Sciences Institute Annual Meeting Proceedings, Montreal, Canada, 1295-1300.
  • Holmes, D., & Mergen, A. (2010). Building an Acceptance Chart Around the Process Mean. The North East Decision Sciences Institute Annual Meeting Proceedings, Alexandria, VA, 563-568.
  • Holmes, D., & Mergen, A. (2009). Use of Acceptance Charts in the Six Sigma Environment. The 2009 Northeast Decision Sciences Institute Annual Meeting Proceedings, Uncasville, CT, 443-448.
  • Holmes, D., & Mergen, A. (2008). An Alternative Method to Test the Residuals in a Regression Model. The 2008 Northeast Decision Sciences Institute Annual Meeting Proceedings, New York New York, 679-684.
  • Holmes, D., & Mergen, A. (2007). Using Descriptive Statistics in Statistical Process Control. The 2007 Northeast Decision Sciences Institute Annual Meeting Proceedings, Baltiomre, Maryland, 566-571.
  • Holmes, D., & Mergen, A. (2006). Multivariate Control Charts for Attribute Data. The 2006 North East Decision Sciences Institute Annual Meeting Proceedings, San Juan, Puerto Rico, 500-505.
  • Holmes, D., & Mergen, A. (2005). Integrating Several Variance Estimators. The 2005 North East Decision Sciences Institute Annual Meeting Proceedings, Philadelphia, PA.
  • Holmes, D., & Mergen, A. (2004). Estimating Potential Capability of an Unstable Process. The 2004 Northeast Decision Sciences Institute Annual Meeting Proceedings, Atlantic City, NJ, 290-292.
  • Holmes, D., & Mergen, A. (2003). Testing Rationality of Subgroups in Multivariate Control Charts. The 2003 North East Decision Sciences Institute Annual Meeting Proceedings, Providence, RI, 286-288.
  • Holmes, D., & Mergen, A. (2002). Acceptance Charts for Low Data Environment. The 2002 North East Decision Sciences Institute Annual Meeting Proceedings, San Juan, Puerto Rico, 273-275.
  • Holmes, D., & Mergen, A. (2001). Modeling in Statistical Process Control. CMA 2001 Conference, Antalya, Turkey, 113-115.
  • Holmes, D., & Mergen, A. (2001). Some Issues in Statistical Process Control. The 2001 Northeast Decision Sciences Institute Annual Meeting Proceedings, Pittsburgh, PA, 263-265.
  • Grant, D., Mergen, A., & Widrick, S. (1999). An Analysis of Quality Management Approaches in Higher Education. Proceedings of the IACIS 1999 Conference, San Antonio, TX, 70-76.
  • Mergen, A., & Bear, M. (1999). Analyzing Balance of Trade Data Using Statistical Process Control Techniques. The 1999 Northeast Decision Sciences Institute Annual Meeting Proceedings, Newport, RI, 73-75.
  • Mergen, A., & Erginbilgic, F. (1998). A Problem with Attribute Control Chart When the Sample Size is not Constant. The 1998 Northeast Decision Sciences Institute Annual Meeting Proceedings, Boston, MA, 311-313.
  • Holmes, D., & Mergen, A. (1997). Testing the Dispersion Matrix for Stability. The Bulletin of the International Statistical Institute, 51 Session, Istanbul, Turkey, 605-606.
  • Holmes, D., & Mergen, A. (1997). Problems with Non-Normal Distributions and Process Performance Measures. The 1997 Northeast Decision Sciences Institute Annual Meeting Proceedings, Annapolis, MD, 299-301.
  • Holmes, D., & Mergen, A. (1996). A Management Tool for Process Evaluation. The 1996 Northeast Decision Sciences Institute Annual Meeting Proceedings, St.Croix, Virgin Islands, 527-529.
  • Mergen, E., & Holmes, D. (1995). Control Charts for Some Special Production Settings. The 1995 Northeast Decision Sciences Institute Annual Meeting Proceedings, Providence, RI, 466-468.
  • Holmes, D., & Mergen, A. (1993). Testing the Randomness of a Process. The Operations Research and Industrial Engineering XVth National Congress Transactions, Istanbul, Turkey, 237-239.
  • Mergen, E., & Pray, T. (1992). Modeling Total Quality Elements into a Strategy-Oriented Simulation. Developments in Business Simulation and Experiential Exercises, 114-121.
  • Holmes, D., & Mergen, A. (1991). A new Control Chart for Short Production Runs. 47th Annual Quality Control Transactions, Rochester Section, Rochester, NY, 111-119.
  • Holmes, D., & Mergen, A. (1988). Selecting Acceptance Sampling Plans by Expected AOQ. The 1988 Northeast Decision Sciences Institute Annual Meeting Proceedings, New Port, RI, 177-179.
  • Mergen, A., & Holmes, D. (1986). Lot Quality Distribution for Dependent Processes. ASQC 40th Quality Congress Transactions, Anaheim, CA, 264-268.
  • Holmes, D., & Mergen, A. (1986). An Average Value Scale for Cumulative Sum Controls Charts. The 1986 Northeast American Institute for Decision Sciences Proceedings, Williamsburg, VA, 286-287.

Book Chapters

  • Mergen, E., & Holmes, D. (2007). Signal to Noise Ratio - What is the Right Size?. Quality Magazine (pp. ). .
  • Mergen, E., & Holmes, D. (2000). Should You Use Acceptance or Modified Control Charts? (part 2). QC Report (pp. ). .
  • Mergen, E., & Holmes, D. (2000). Should You Use Acceptance or Modified Control Charts? (part 1). QC Report (pp. ). .
  • Mergen, E., & Holmes, D. (1999). Data Precision-Do You Have Enough?. QC Report (pp. 2-4). .
  • Mergen, E., & Holmes, D. (1989). Z-Cp Chart: A Managerial Tool for Process Capability Analysis. QC Report (pp. ). .
  • Mergen, E., & Holmes, D. (1988). Chi-Square vs. X-bar and R Chart. QC Report (pp. ). .
  • Mergen, E., & Holmes, D. (1987). The Cumulative Sum Chart: A Good Tool for process Control. QC Report (pp. ). .
  • Mergen, A., & Holmes, D. (2015). Process Management. Encyclopedia of Quality and the Service Economy (pp. 500-507). SAGE Publications, Inc.

Presentations

  • Mergen, E., & Holmes, D. (2008). Statistical Process Control and Acceptance Charts. The 60th Annual North East Quality Council Conference, Oct.14-15, 2008, NEQC of ASQ.
  • Mergen, E., Aybar, B., Perotti, V., & Reid, D. (2004). ƒ&#8364ŒAnalysis of Attitudes of Turkish Citizens toward the effect of European Union (EU) Membership on the Business Climateƒ&#8364. The 2004 AIB Annual Meeting..
  • Mergen, E., & Holmes, D. (1994). Identifying the Key Variables Using Factor Extractor. The 48th Annual North East Quality Council Conference, Oct. 5-7, 1994..
  • Mergen, E., & Holmes, D. (1992). Statistical Process Control Analysis of Partial Size Distributions,. The 3rd International Ceramic Science and Technology Congress November 1-4, 1992..
  • Mergen, E., & Pray, T. (1991). Modeling Total Quality into Business Simulations - A Demonstration. ABSEL Meeting, Nashville, TN, April 3-5, 1991..

Working Paper


  • 2017: Holmes, D., & Mergen, A., "Revision of Cp and Cpk When the Process Average is not Stable".

  • 2017: Holmes, D., & Mergen, A., "Alternative Methods to test for Internal Consistency and Uni-dimensionality".

  • 2017: Mergen, A., & Stevenson, W., "A Bakery Uses Lean Six Sigma to Improve its Operations – A Case Study".

  • 2017: Holmes, D., Mergen, A., & Uysal, M., "Acceptance Charts: Underutilized Tools in Quality Management" – soon to be submitted for review..

  • 2015: Holmes, D., & Mergen, A., Use of Acceptance Charts When Data is Low. Work in progress.

  • 2014: Holmes, D., & Mergen, A., Use of Acceptance Charts When Data is Low.. Work in progress

  • 2013: Holmes, D., & Mergen, A., A First Order Markov cahin Model for Autocorrelated Processes.

  • 2013: Holmes, D., & Mergen, A., A Note on an Alternative Way to Test the Autocorrelation of Error Terms in a Regression Model.

  • 2012: Uysal, M., & Mergen, A., A Quality-Oriented Approach to Software Reengineering.

  • 2012: Stevenson, W., & Mergen, A., Estimating Seasonal Relatives Using Simple Averaging: Not Just for Stationary Data. Revised and submitted.

  • 2012: Holmes, D., & Mergen, A., Use of Acceptance Charts when the data is Low.

  • 2012: Holmes, D., & Mergen, A., Some Comments about Process Control and Engineering Control.

Other


  • 2012: Mergen, A., Other Research Activities. II. Scholarship/Intellectual Contributions (including your IC stream): II.A. Output (Refereed publications, etc.): 1. “Control Limits vs. Acceptance Limits - Which Limits Are Appropriate For Your Task?” (with D.S. Holmes), The 2012 Northeast Decision Sciences Institute Meeting Proceedings, Newport, RI, March 21-23, 2012, pp. 415-421. II.B. Pipeline: UNDER REVIEW: 1. “Converting Survey Results from 4-Point to 5-Point Scale” (Initial submission in April, 2012; revised and re-submitted in August, 2012. After the second review, some more revisions have been requested. I am in the process of doing that.) Some surveys use a scale which does not include the “Neutral” response (i.e., 4-point scale). The choice to switch to the Likert scale (i.e., 5-point scale) gives rise to the need to convert early scale results to the Likert scale to maintain comparability over time. It is the purpose of this paper to demonstrate a technique (we demonstrate the use of a skewness adjusted Normal distribution) and evaluate its effectiveness in this environment. 2. “A Quality-Oriented Approach to Software Reengineering” The purpose of this paper is to present a quality-oriented SR methodology. We integrate software engineering activities, the Six Sigma process, and the Software Quality Requirements and Evaluation (SQuaRE) standards. WORK IN PROGRESS: 1. “Estimating Seasonal Relatives Using Simple Averaging: Not Just for Stationary Data” – work in progress. 2. “Use of Acceptance Charts When Data is Low” – work in progress. 3. “Testing Randomness of the Error terms in Regression Model” – work in progress. 4. “Statistical Process Acceptance vs. Statistical Process Control” – work in progress. 5. “A Rationalization of constants h and k used in Modified Cumulative Sum Schemes” – work in initial stage. 6. “Dependent Multivariate Data and SPC” – work in initial stage. OTHER: •Continued to serve as a member of the Editorial Board of the Quality Engineering journal. •Continued to serve as a member of the International Editorial Board of the Total Quality Management and Business Excellence journal. • Presented a paper at the Northeast Decision Sciences Institute Meeting, March 2012. • Chaired a session at the Northeast Decision Sciences Institute Meeting, March 2012. •Reviewed papers for Quality Engineering journal. •Reviewed papers for Total Quality Management and Business Excellence journal. CITATIONS: The paper that we published in 1993 (“Improving the Performance of the T2 Control Chart,” Quality Engineering, 5(4), 1993) continues to get attention and citations in the multivariate SPC arena, both in journals and conferences, year after year. Recently, this paper was cited again in a paper entitled “A Bayesian Approach to Change Point estimation in Multivariate SPC,” which appeared in the Journal of Quality Technology, 44(3), 2012, top ranked journal in the field of quality. In that paper we proposed an alternative way of calculating the variance/covariance matrix by taking into account the order of the data (i.e., by using the mean square successive differences) which is more suitable for some of the multivariate SPC applications and makes the T2 control chart (a multivariate tool) more sensitive to changes in the process.