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Do we need normal data for gage r&r studies?

#1
Hello guys,

Is the measurement data should be normal when we do gage r&r studies? Is the normality of data play any important role in gage studies?

Thank you
 
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Miner

Forum Moderator
Staff member
Admin
#2
The quick answer is NO.

Technically, the residuals of the ANOVA analysis should be normally distributed. However, with a typical sample size of 90 (3 x 3 x 10), the normality assumption is no longer important. Regardless, normality of the raw data is never a requirement.
 

Miner

Forum Moderator
Staff member
Admin
#4
For a standard MSA, you should never have to check for normality. Normality becomes important when you perform capability studies or certain statistical analyses that depend upon the assumption of normality.
 

Bev D

Heretical Statistician
Staff member
Super Moderator
#5
Adding to Miner's excellent comments remember that SPC doesn't require Normality either....and capability studies only require normality when you are conflating the index with a projected defect rate that relies on the Normal distribution model. Normality is a special unique occurrence. is not typical or necessary.
 
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