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Special Cause Variation

Special cause variation represents unpredictable, intermittent changes in process performance. These changes result from specific, identifiable factors outside the normal operating system. Unlike common cause variation, special cause variation does not occur naturally...

Simple Linear Regression

Simple linear regression is a powerful statistical tool used to model the relationship between two variables: one independent (x) and one dependent (y). Whether you’re predicting sales based on advertising spend or analyzing trends in data, this method helps you...

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...

Shewhart

Shewhart recognized two types of variation, namely the special-cause variation’ and the ‘common cause variation, he’s the inventor of control charts. The Shewhart model shows two types of variation can be called ‘assignable cause’ and...
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