Long Term Process Capability from miltiple Machines and Fixtures

bkirch

Involved In Discussions
#1
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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Miner

Forum Moderator
Staff member
Admin
#2
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.
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#3
I always start with a multi-vari chart to accomplish what Miner suggests...
 
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