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What's New

Custom/QC™ version 3.0 released.

Stochos offers Process Improvement services.

In the News

"Use of Acceptance Charts in the Six Sigma Environment", The 2009 Northeast Decision Sciences Institute Meeting Proceedings, Uncasville, CT, April 1-3, 2009, pp. 443-448.

"An Alternative Method to Test the Residuals in a Regression Model", The 2008 Northeast Decision Sciences Institute Meeting Proceedings, New York, New York, March 28-30, 2008, pp. 679-684.

"Statistical Process Control and Acceptance Charts". Presented at the 60th Annual North East Quality Council Conference, Marlborough, MA, Oct.14-15, 2008.

"Using Descriptive Statistics in Statistical Process Control", The 2007 Northeast Decision Sciences Institute Meeting Proceedings, Baltimore, Maryland, March 28-30, 2007, pp. 566-571.

"Signal to Noise Ratio - What is the Right Size?" Quality Magazine website (http://www.qualitymag.com/Articles/White_Papers), August 2007.

"Identifying Need for New Factors in EVOP", Quality Engineering, Vol.18. No.2, 2006, pp.219-224.

"Multivariate Control Charts for Attribute Data", The 2006 Northeast Decision Sciences Institute Meeting Proceedings, San Juan, Puerto Rico, March 30-April 1, 2006, pp. 500-505.

"Integrating Several Variance Estimators", The 2005 Northeast Decision Sciences Institute Meeting Proceedings, Philadelphia, PA, March 30-April 1, 2005 (Conference CD).

"Effect of Multivariate Process Instability on Principal Component Analysis - A Case Study", American Association of Pharmaceutical Scientists (AAPS) Journal - formerly AAPS Pharm. Sci., Vol.7(1), 2005, pp.E106-E117.

"Estimating Potential capability of an Unstable Process", The 2004 Northeast Decision Sciences Institute Meeting Proceedings, Atlantic City, NJ, March 24-26, 2004, pp.290-292.

"A Multivariate Subgroup Rationality Test", Quality Engineering, Vol. 16, No.4, 2004, pp.655-660.

"Testing the Rationality of Subgroups in Multivariate Control Charts", The 2003 Northeast Decision Sciences Institute Meeting Proceedings, Providence, RI, March 27-29, 2003, pp. 286-288.

"Acceptance Charts for Low Data Environment", The 2002 Northeast Decision Sciences Institute Meeting Proceedings, San Juan, Puerto Rico, March 20-22, 2002, pp. 273-275.

"Variation Charts for Multivariate Processes" (with W. Levinson), Quality Engineering, Vol. 14, No.4, June of 2002, pp.539-545.

"Tracking the elusive process using EVOP", Control Solutions Magazine, January 2001, Volume 74, Issue 1, Control Software Forum.

"A ProActive solution approach", David Harrold, Control Engineering, April 2001

"Measuring Process Performance for Multiple variables - Revisited", Quality Engineering, Vol.13, No.4, June 2001, pp.661-665.

"A Tool to Monitor Processes", Istatistik, Journal of Turkish Statistical Association, Vol.3, No.1&2, 2001, pp.21-28.

"Some Issues in Statistical Process Control", The 2001 Northeast Decision Sciences Institute Meeting Proceedings, Pittsburgh, PA, March 21-23, 2001, pp. 263-265.

"Modeling in Statistical Process Control", CMA 2001 Conference Proceedings, Antalya, Turkey, Dec.7-9, 2001, pp.113-115.

"Building an Acceptance Chart" - These handy tools can help you meet specification limits., Donald S. Holmes and Erhan Mergen, Quality Digest, June 2000

"EWMA Acceptance Charts", Quality and Reliability Engineering, International journal, Vol.16, No.2, 2000, pp.1-4.

"Process Performance Measures When Process Distribution is Non-Normal", Istatistik - Journal of the Turkish Statistical Association (JTSA), Vol.2, No.3, 1999-2000, pp.165-174.

"Should You Use Acceptance or Modified Control Charts? (Part I)", QC Report, February 2000.

"Should You Use Acceptance or Modified Control Charts? (Part II)", QC Report, May 2000.

"Process Analysis Software Cuts Fuel Costs", Nancy Chase, Quality Magazine, June 1999, p.48-50

"Data Precision - Do You Have Enough?", QC Report, October 1999, pp.2-4.

"Multivariate Test for Randomness", Quality Engineering, Vol.10, No.3, 1998, pp.505-508.

"Lot Quality Distribution for Autocorrelated Data", Istatistik, Journal of the Turkish Statistical Association,Vol.1, No.1, 1998, pp.43-50.

"Measuring Process Performance for Multiple variables", Quality Engineering, Vol. 11, No.1, 1998-1999, pp.55-59.

"Process Acceptance Charts for Short Runs", Quality Engineering, Vol.10, No.1, 1997, pp.149-153.

"Problems with Non-Normal Distributions and Process Performance Measures", The 1997 Northeast Decision Sciences Institute Meeting Proceedings, Annapolis, Maryland, April 2-4, 1997, pp.299-301.

"Testing the Dispersion Matrix for Stability", The Bulletin of the International Statistical Institute, 51st Session , Istanbul, Turkey, August 18-27, 1997, Book 2, pp.605-606.

"Data Collection Leads to Real Time SPC", Metalforming Magazine, 1996

"Quality Analysis of Assemblies, Assembly Products", Assembly, September 1996, Volume 39, Number 8

"Don't Judge This SPC Package By Its Cover", Gary L. Parr, Quality Magazine, September 1996, Volume 35 Number 9, p. 62

"A Management Tool for Process Evaluation", The 1996 Northeast Decision Sciences Institute Meeting Proceedings, St.Croix, April 17-19, 1996, pp.527-529.

"Control Charts for Some Special Production Settings", The 1995 Northeast Decision Sciences Institute Meeting Proceedings, Providence, Rhode Island, March 22-24, 1995, pp.466-468.

"An Alternative Method to Test for Randomness of a Process", Quality and Reliability Engineering, International, Vol.11, No.3, June 1995, pp.171-174.

"Identifying the Sources for Out-of-Control Signals When T2 Control Chart is Used", Quality Engineering, Vol.8, No.1, 1995, pp.137-143.

"Identifying the Key Variables Using Factor Extractor". Presented at the 48th Annual Northeast Quality Council Conference, Melville, L.I., New York, Oct. 5-7, 1994.

"Improving the Performance of T-square Control Chart", Quality Engineering, Vol.5, No.4, 1993, pp.619-625.

"Testing the Randomness of a Process," The Operations Research and Industrial Engineering XVth National Congress Transactions, Istanbul, Turkey, July 7-9, 1993, pp.237-239.

"Statistical Process Control Analysis of Partial Size Distributions". Presented at The 3rd International Ceramic Science and Technology Congress, San Francisco, November 1-4, 1992.

"Parabolic Control Limits for the Exponentially Weighted Moving Average Control Chart", Quality Engineering, Vol. 4, No. 4, 1992, pp.487-495.

"A New Control Chart for Short Production Runs", 47th Annual Quality Control Transactions, Rochester Section of American Society for Quality Control, Rochester, N.Y., March 12, 1991, pp.111-119.

"A Discussion of the Unit of Calibration Required for a Gauge", Quality Engineering, Vol. 4 , No.1, 1991, pp.1-7.

"The Dynamic Histogram Chart", Quality and Reliability Engineering, International, Vol.6, No.2, April-May 1990, pp.107-111.

"Testing Control Chart Subgroups for Rationality", Quality and Reliability Engineering, International, Vol.5, No.2, April-June 1989, pp.143-147.

"Z-Cp Chart: A Managerial Tool for Process Capability Analysis", QC Report, Vol.3, No.1, 1989.

"A Managerial Tool for Process Capability Analysis", Quality and Reliability Engineering, International, Vol.4, No.1, January-March 1988, pp.63-66.

"Selecting Acceptance Sampling Plans by Expected AOQ", The 1988 Northeast Decision Sciences Institute Meeting Proceedings, New Port, Rhode Island, March 23-25, 1988, pp.177-179.

"Proper Subgroup Size for Statistical Process Control", Quality and Reliability Engineering, International, Vol.4, No.4, October-December 1988, pp.339-345.

"Chi-Square vs. X-bar and R Chart", QC Report, Vol.2, No.2, 1988.

"A Good Tool for Process Control: The Cumulative Sum Chart", Quality, February 1987, pp.71-72.

"The Cumulative Sum Chart: A Good Tool for Process Control, Summer 1987 issue of QC Report.

"Chi-Square vs. X-bar and R Chart", Quality, February 1986, pp.60-61.

"An Average Value Scale for Cumulative Sum Controls Charts", 1986 Northeast American Institute for Decision Sciences Proceedings, Williamsburg, VA, March 1986, pp.286-287.

"Lot Quality Distribution for Dependent Processes", ASQC 40th Quality Congress Transactions , Anaheim, California ,May 1986, pp.264-268.

"Markov Chains and Discovery Sampling". Presented at the Regional Meeting of the American Society for Quality Control, Reading, Mass., 1978.