Capability analysis for normal data
The calculations for capability analysis are based on the following assumptions:
- The data is normally distributed . In other words, the shape shown by the histogram follows the "normal" bell curve .
- The system being studied is stable and no assignable causes for variation are present. A control chart of the system has been made to determine stability before a capability analysis is done.
- The mean of the system being studied falls between the upper and lower specification limits defined for the process.
If these assumptions are not met, the results of a capability analysis will be misleading.
>> Can a process produce output within specifications?
>> Capability vs control
>> Non-normal data capability analysis
>> What is capability analysis and when is it used?
>> What are the capability indices?
>> Learning more about capability