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Specification Limits

Specification Limits are targets based on the customer requirements or expectations. The Voice of the Customer is the customer’s specification limits. They are different than control limits, which are calculated according to the control chart you are using....

Special Cause Variation

Six Sigma special cause variation is intermittent variation attributed to assignable events. Control charts are often used to distinguish between special cause variation and common cause variation. If the process measurement control chart shows a plotted point or...

Simple Linear Regression

simple regression least squares In statistics, simple linear regression is a simple regression line (or a linear regression) model with a single explanatory variable. That is, it concerns two-dimensional sample points with one independent...

6 Sigma

Six Sigma (6σ) is a set of techniques and tools for process improvement. A 6 sigma process is one in which 99.99966% of all opportunities to produce some feature of a part are statistically expected to be free of defects. The main goal of this methodology is to...

Control Chart

Control charts, also known as Shewhart charts (after Walter A. Shewhart) or process-behavior charts, are a statistical process control tool used to determine if a manufacturing or business process is in a state...