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Statistical Process Control
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Overview
1. Definition of Statistical Process Control
2. Common causes and assignable causes of variation
3. Control charts
4. Type I and Type II Errors
5. R, x, p, and c charts
6. Process Distribution
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Definition of SPC
Statistical process control (SPC) is the application of statistical techniques to determine whether the output of a process conforms to the product or service design.
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Common causes of variation
Process Distribution for the Box-Filling Machine When Only Common Causes of Variation Are Present
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Assignable causes of variation
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Effects of Assignable Causes
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Control Charts - Examples
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Type I and Type II Errors
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R-chart
A range chart, or R-chart, is used to monitor process variability.
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x-ChartsAn x-chart (read " x-bar chart") is used to measure the mean.
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p-ChartsThe p-chart is a commonly used control chart for attributes.
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c-ChartsWhen management is interested in reducing the number of defects per unit, another type of control chart, the c-chart, is useful.
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Process Distribution
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Conclusion
1. Definition of Statistical Process Control
2. Common causes and assignable causes of variation
3. Control charts
4. Type I and Type II Errors
5. R, x, p, and c charts
6. Process Distribution
= Quality Control and Lower Costs