Effect of autocorrelated data on composite panel production monitoring and...

Forest Products Journal;  March 1, 2002 ;     700+ words ......conditions, traditional SPC techniques are not adequate...for assignable or special causes that may not, in...industry has used many SPC techniques to monitor the process...assignable causes or special causes is tedious and expensive...

SPC and Why it Failed in the Fastener Industry: ONGOING APPLICATIONS OF...

American Fastener Journal;  January 1, 2004 ;     700+ words ......us to look at chart interpretation. SPECIAL CAUSES These are the anomalies accruing outside...statistical probability. Identifying special causes and eliminating those causes is a mission...outside this model are considered "special causes." COMMON CAUSES This is all the variation...

Use Ppk and Cpk to reduce customer conflicts

Manufacturing Engineering;  March 1, 1997 ;     510 words ......Ppk, sigma reflects total variation due to both common and special causes. If you eliminate all special causes from a process, then Cpk and Ppk will be the same. If special causes are present, Ppk's sigma will be greater than Cpk's, and Ppk...

A mean-shift pattern study on integration of SPC and APC for process...

IIE Transactions;  March 1, 2003 ;     700+ words ......importance of Statistical Process Control (SPC) techniques in quality improvement is well-recognized...SPC in various applications. Although SPC techniques are popular, the current methods have...for long-term process improvement, SPC techniques are still needed to detect the out...

Technical aids: Notes on the Shewhart control chart

Journal of Quality Technology;  January 1, 1999 ;     700+ words ......assignable" causes and by Deming (1986, p. 310) "special" causes. Signals of special causes indicate that a process is doing something...rise to such signals. When the existence of special causes is no longer indicated, the process is said...

Making informed decisions in the face of uncertainty

Quality Progress;  October 1, 2000 ;     700+ words ......graphically, regardless of whether analysis is using SPC techniques. Prioritize corporate indicators to be analyzed using SPC. Use SPC techniques to analyze and present all performance measures reported...leading indicator will become the demonstration of SPC techniques for each ...

Optimize process regulation

Chemical Engineering Progress;  December 1, 2001 ;     700+ words ......inexpensive adjustments to the process. SPC techniques for detecting breakdowns in the process...problem is one in which traditional SPC techniques excel. Since a catalyst replacement...proceeding. Statistical-process-control (SPC) techniques can give us that confidence. Product...

The control chart dilemma

Quality Progress;  February 1, 1998 ;     700+ words ......limitations faced by those using traditional SPC techniques. Limitation No. 1: 15 to 25 data points...statistical control limits. Traditional SPC techniques were developed to be applied to long...one is armed only with traditional SPC techniques. Limitation No. 2: Only one ...

SPC for Short-Run Manufacturing

Quality Progress;  October 1, 1998 ;     416 words ......I had hoped to see more in-depth treatment of short-run SPC techniques, with more examples relating back to what was actually happening...this book only devotes a small section to actual short-run SPC techniques, it is a good text on basic SPC. The areas of quality cost...

Measuring up to expectations.

Precision Toolmaker;  January 1, 2001 ;     700+ words ......to make and the benefits to be gained, less known. Even SPC techniques, which so many companies claim to use, can be a grey area...process. The information about the production line provided by SPC techniques can lead to the extraction of all sorts of secondary information...

Conflict over Ppk and Cpk

Manufacturing Engineering;  May 1, 1997 ;     700+ words ......pk^, sigma reflects total variation due to both common and special causes. "If you eliminate all special causes from a process, the two will be the same," they said. Special causes will make the sigma of P^sub pk^ greater than that of C^sub...

Rethink checkoff boxes on Maine income tax returns ; Giving a few special...

Portland Press Herald (Maine);  July 11, 2006 ;     347 words ...Portland Press Herald (Maine) 07-11-2006 Rethink checkoff boxes on Maine income tax returns ; Giving a few special causes a boost on fundraising is neither fair nor wise. Edition: FINAL Section: Editorial Maine is adding two more checkoff boxes...

Transforming non-normal data to normality in statistical process control

Journal of Quality Technology;  April 1, 1998 ;     700+ words ......Johnson-transformed data. Introduction MANY SPC techniques require that the quality characteristic...decisions if we apply normal-based SPC techniques when the sample data indicate that...normal data to normality and apply SPC techniques to the transformed data. Unfortunately...

New license plates.(NEWS)

New York State Conservationist;  October 1, 2006 ;     84 words ...The Marine and Coastal District of New York license plate is the newest in the special causes series. Joining plates that support open space conservation and cancer research--among others--it raises both money and awareness...

Stop Rejecting Good Batches - Use a Signal-to-Noise Transformation

Biopharm International;  July 1, 2005 ;     700+ words ......statistical process control (SPC) techniques, but a relatively brief...assignable causes are present. Special causes are typically related to...underlying concept in identifying special causes is known as rational subgrouping...should be selected so that if special ...