#### GR&R Report

Gage Repeatability & Reproducibility Reports provide analyses of measurement variations by breaking down variation into repeatability and reproducibility, according to one of three possible test types: GR&R, Capability, and ANOVA. Using the GR&R Selection dialog box you can tailor the GR&R Report to switch between these types as well as include information such as the raw data used for the analyses, “judgment” sections, and calculations. Configuration options will differ depending upon the chosen test type.

Sample Report

Creating a GR&R Report

1. 1. Access the Text tab.

   2. Click the Text Report icon.

   3. Select GR&R Report.

   4. The GR&R Selection dialog box appears.

   5. Fill out the dialog box and click OK.

GR&R Selection Options

GR&R Selection dialog box

Test type - Use this list to select the type of test to be applied to the report data. You can choose one of the following:

- GR&R - This uses the average and range method for reporting repeatability and reproducibility.

- CAPABILITY - This reports capability statistics.

- ANOVA - This produces an Analysis of Variation Table.

Master value - This value applies only to reports based on the Capability test type. If you have chosen CAPABILITY as the Test type for the report, use this box to enter a master measurement value to be used for the report’s calculations. This value should be a known, accurate measurement value for the part.

Sigma of process - This value applies only to reports based on the Capability test type. Use this field to enter the sigma value that will be the basis for the Capability Report’s calculations.

Operator field - Use this list to select the name of an existing trace field. The associated trace values will be extracted for the report.

Part field - Use this list to select the name of an existing trace field. The associated trace values will be extracted for the report.

Trial field - Use this list to select the name of an existing trace field. The associated trace values will be extracted for the report.

Configuring the GR&R Report

Note: For the mathematical formulas to display properly in this help file, please download and install the free MathPlayer. Once this is installed, refresh this topic. The page will then display the math formulas in blue text. Clicking on these formulas displays them in a slightly larger size.

GRR Report Option

Calcs Based On - This list applies only to reports using the

GR&R test type. Use this field to select the CalcBase value used to calculate the constants K1, K2, and K3. You can select the American standard, which uses 5.15 (99% of the area under the normal distribution curve), or the European standard, which uses 6.0 (99.99% of distribution). If you select the American method, the report’s Variation Table will display values for PV and % of Total Variation. The European method will not display these values. For Capability test type reports, the values for % Variation (Cg) field will display differing values depending upon whether you have used the American or European method.

Show Judgment - Mark this check box to include a judgment in reports that use the GR&R or ANOVA test types.

In reports that use the GR&R test type, a “Judgment” column appears in the Variation Table. The judgment rates the reported variations as either GOOD, FAIR, or POOR according to the following criteria:

- GOOD - `%(R\R) / (TV) < 10`

- FAIR - `10 < %(R\R) / (TV) < 30`

- POOR - `% (R\R) / (TV) > 30`

`%(R\R)/(TV)` is the percent of the total variation that is caused by variation in repeatability and reproducibility.

In reports that use the ANOVA test type, a judgment line appears below the Analysis of Variation Table. The judgment provides values for a and F and rates the interaction between operators and parts as either significant or not significant.

Calculations - This check box applies only to reports using the GR&R test type. Mark this box if you want to include a list of calculations for repeatability, reproducibility, repeatability & reproducibility, part variation, total variation, and tolerance.

See also:

- ANOVA Test Type

- Capability Test Type

- GR&R Test Type