Select Page

Decision Rules

The Western Electric (WECO) rules spc, are decision rules used in Statistical Process Control to detect “out-of-control” or non-random conditions. The location of the observations relative to the control chart limits (typically at +-3 standard deviations)...

Cyclical Variation

Cyclical variation is often used to describe a repeating pattern, such as a seasonal variation in sales that peaks before Christmas. Cycle time variation is a metric and philosophy for continuous improvement with the aim of driving down the deviations in the time it...

Curvature

In mathematics, curvature is any of several strongly related concepts in geometry. Intuitively, it is the amount by which a curve deviates from being a straight line, or a surface deviates from being a plane. In an...

Cpk Explained: Formula, Benchmarks, and How to Improve It

Your process has been running for weeks. The output looks reasonable. But a customer audit is coming, and they want to see your Cpk. Do you know what it is? More importantly, do you know what it means? Cpk — the Process Capability Index — is one of the most commonly...

Correlation Coefficient

A correlation coefficient is a statistical measure that quantifies the degree of correlation between two variables. It provides insights into the strength and direction of the relationship between variables. In many practical scenarios, we encounter data on two or...
Secret Link