Minimum number of Subgroups to assess Process Capability

#1
What is considered to be the minimum number of subgroups to assess process capability? I have been using 20 but have now been informed that 25 should be used. Is this correct?
 
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D.Scott

#4
Hi David - welcome to the Cove.

An automotive PPAP using an X-bar and R chart would require a minimum of 25 subgroups containing at least 100 consecutive samples.

Dave
 
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