Analyze Gage R and R Experiments

Analyzes standard gage repeatability and reproducibility experiments, computes variance components, and performs percent-of-tolerance analyses. Select the variables for Operators, Parts, and Trials (optional) in exactly that order into the list of categorical predictor variables. Use the Variance Components and General Linear Models facilities to analyze complex (non-standard, non-balanced) experimental designs with random effects (to analyze variance components).

General

Element Name Description
Detail of computed results reported Specifies the detail of computed results reported. If Minimal results is selected, all standard Gage R and R results are computed (variance components, R and R plot, etc.) If Comprehensive results is chosen, various control charts by operator and part are also computed; if All results is requested, descriptive statistics and box-whisker plots are also reported.
p for confidence limits Enter the value that will determine the confidence interval that will be computed for the Sigma estimates and Sigma spreads.
Total tolerance for parts Enter the tolerance value you want to use. The tolerance value is used to compute the percent tolerance values, that is, to express the variability due to reproducibility and repeatability errors relative to the engineering tolerance.
Number of sigma intervals Enter the number of Sigma intervals to use. This parameter is used to determine the range of repeatability and reproducibility errors; by default (number of sigma intervals = 5.15), this range contains 99% of the errors, assuming the normal distribution.
Adjust appraiser variability Use this option to compute the appraiser (reproducibility or between-operator) variability from ranges using formulas widely cited in the literature. See the Electronic Manual for details.
Two-way interaction If this option is selected, then the operator by parts interaction will not be included in the computation of the variance components and their confidence limits.
Complete ANOVA Table Creates the complete ANOVA table. Two results spreadsheets will be computed: the first spreadsheet will report a complete ANOVA table, where all variability is partitioned into main effects, two-way interactions, and the three-way interactions. The second spreadsheet will report an ANOVA table where only the operator by parts interaction is estimated separately (unless the No 2-way interaction option is selected), and where all remaining variability is treated as error variance.
Plots of operators and parts Select this option to display a plot that shows the average ratings of each part by each operator. Use this plot to examine the extent to which different operators produced similar patterns of ratings across parts.