The ANOVA Table Results

Jun 29th, 2015
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The first column is the source of variability. Remember that a Gage R&R study is a study of variation. There are five sources of variability in this ANOVA approach: the operator, the part, the interaction between the operator and part, the equipment and the total.

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August 2012This month's newsletter is the first in a multi-part series on using the ANOVA method for an ANOVA Gage R&R study. This method simply uses analysis of variance to analyze the results of a gage R&R study instead of the classical average and range 52.22.082.16B13.083.253.072.98000.001322.531.782.3234.193.944.3443.014.033.252.441.81.72C13.042.892.852.69470.062121.621.872.0433.884.093.6743.143.23.1151.541.931.55Sum of Deviations0.108715(Sum of Deviations)1.6304Thus,SSO = 1.6304So, you can see that the sum of squares due to the operators is based on how the operator averages deviate from the overall average. There are three operator averages. Since we calculated the overall average, we lost one degree of freedom. The degrees of freedom associated with the operators are 3 - 1 = 2, or k -1 = 2.The variability chart below shows the results by operator by part. The horizontal blue line is the average for the operator. The horizontal green line is the overall average. The difference between those two lines is the deivation. The first column is the source of variability. Remember that a Gage R&R study is a study of variation. There are five sources of variability in this ANOVA approach: the operator, the part, the interaction between the operator and part, the equipment and the total.The second column is the degrees of freedom associated with the source of variation. The third

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