Long Term Process Capability from miltiple Machines and Fixtures

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When conducting long term process capability studies, and the data is from multiple machines and/or fixtures, should the process capability be looked at by combining all of the data or by looking at the data per machine, fixture, etc.?
 
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Re: Long Term Process Capability

You should never mix process streams unless first testing whether they are statistically different.

Study each stream separately first. Then you can perform a t-test or ANOVA depending on the number of streams to determine whether these streams are statistically different. If they are not, you could then combine them.
 
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