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Necessary Measures

by Johnson, Louis; Deaner, Maureen;

Learn the difference between standard and expanded gage repeatability and reproducibility (R&R) studies and how expanded gage R&R helps clarify measurement system variation....


Expert Answers: April 2014

by QP Staff

Coordinate measuring machine profile capability ......


Measure for Measure: Are You Sure?

by Grachanen, Christopher L.

From a metrological purist perspective, measurement results reported with just an interval do not give sufficient information as to the uncertainty (unlikelihood) that the obtained results are within their stated interval....


Parts of the Process

by Aguirre-Torres, Victor; López-Alvarez, Maria Teresa

Repeatability and reproducibility studies are based on the concept of variance components estimation. This is a remarkable achievement of statistical science because people usually think in terms of means and trends, not variation around a mean....


Open Access

Paving the Way

by Anderson-Cook, Christine M.; Borror, Connie M.

Data and information are at the heart of good investigations and decision making, but are all kinds of data the same? What are the major categories and types of questions to ask to collect and analyze data?...


Statistics Roundtable: Getting Graphical

by Borror, Connie M., White, T. Kevin

A company has six manufacturing processes critical to its business success. Management recently required each area manager to provide quarterly reports on the performance of their particular process....


Measure for Measure: According to Specifications

by Shah, Dilip

My previous column discussed the averages and computation of different standard deviations. On the heels of that, it makes sense to discuss basic measurement considerations and specifications....


Statistics Roundtable: Gage R&R Reminders

by Hare, Lynne B.

Major characteristic specification limits of a popular brand were 3% and 4%. Product with lower than 3% lacked consumer appeal, and product with greater than 4% had reduced shelf life....


Expert Answers: March 2011

by QP Staff

Explaining rework verification ... Getting management involved ... Measurement confusion....


Statistics Roundtable: Grab the Brass Ring

by Snee, Ronald D.

Remember going to the amusement park and riding the carousel or merry-go-round? During the ride, there was sometimes a brass ring you could grab from a dispenser.It took some dexterity to snatch the ring from the dispenser as the carousel rotated....


Measure for Measure: Appraiser Variation in Gage R&R Measurement

by Ermer, Donald

In part one of this column, I said if our data analysis is inaccurate, it does not represent the true quality characteristics of the part or product being measured, even if we're using quality improvement tools correctly....


Open Access

Measure for Measure: Improved Gage R&R Measurement Studies

by Ermer, Donald

Many manufacturers are using tools like statistical process control (SPC) and design of experiments (DoE) to monitor and improve product quality and process productivity. However, if the data collected are not accurate and precise, they do not...


Are You Making Decisions in a Fog?

by Snee, Ronald D.

Just as water makes up two thirds of the world's surface, measurement constitutes an enormous part of the scientific method and scientific problem solving....


Measurement Capability

by Stein, Philip

Measurements are made all the time: in processes, to see how well work is progressing and in commerce. Most of the time, we trust these measurements are adequate for the task....


Eight Essential Tools

by Snee, Ronald D.

The broad use of Six Sigma since its introduction in the 1980s has taught us much about how to make the best use of Six Sigma tools. Now we need to take a look back and reflect on what we’ve learned...


Column: Statistics Roundtable: My Process Is Too Variable--Now What Do I Do?

by Snee, Ronald D.

Keys to success are comprised of understanding the process, selecting the right variables, designing the right sampling scheme, carefully collecting the data according to the plan and doing a careful analysis that pays close attention to the limitations...


My process is too variable--now what do I do?

by Snee, Ronald D.

How to produce and use a successful multi-vari study

How to produce and use a successful multi- vari study by Ronald D. Snee Process Schematic FIGURE 1 The process Process outputs Controlled variables Customer Process inputs Uncontrolled noise variables Manufacturing Process Variables TABLE 1 Process input...


Fit and Flow of Quality

by Bell, Timothy; Becker, Timothy

Advanced Product Quality Planning (APQP) is a process that uses powerful tools offering a way to resolve problems before they affect customers. If the process is not approached in an appropriate manner, however, its result may be less than positive. The...



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