Capability
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Capability Analysis: How is it made?

These steps assume that a control chart has been previously constructed and the system has been determined to be stable. Since a control chart has been constructed, one can assume that the average range (R-bar ) and the grand mean (X-double bar) have also been calculated. The specifications are also assumed to be known. These steps address capability for variables data.

1. Construct a histogram.
   
   
2. Calculate the estimated standard deviation.
   
   
3. Sketch the distribution.
   
   
4. Calculate the percent outside the specifications.
   
   
5. Calculate the Cp and Cpk.
   
   
6. Analyse the results.
   

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