Select the method or formula of your choice.

- Test-retest error (Repeatability)
- The test-retest error in the EMP statistics table is the square root of
the test-retest error variance in the variance components
table.
(Repeatability)

^{0.5}= (MS_{Repeatability})^{0.5} - Degrees of freedom
- The degrees of freedom depend on whether the analysis includes the Part*Operator interaction. Without the interaction, the analysis uses the following formula:
- Probable error
- 0.674490 * (Repeatability)
^{0.5}

Use the variance components to calculate the intraclass correlation. The value of the
intraclass correlation determines the gage classification.

- Intraclass correlation (no bias)
- Part / (Part + Test re-test error)
- Intraclass correlation (with bias)
- Part / (Part + Test re-test error + Operator)
- Intraclass correlation (with bias and interaction)
- Part / (Part + Test re-test error + Operator + Part*Operator)

- Bias impact
- Intraclass correlation (no bias) – Intraclass correlation (with bias)
- Bias and interaction impact
- Intraclass correlation (no bias) – Intraclass correlation (with bias and interaction)

- Test-Retest Error (Repeatability)
- Equipment variation, the standard deviation is calculated as:
- Degrees of freedom
- The calculation of the degrees of freedom is from Appendix
C
^{1}. In cases where the degrees of freedom are not on the table in Appendix C, use the following formula: - Probable error
- 0.674490 * (Repeatability)
^{0.5}

Use the variance components to calculate the intraclass correlation. The value of the
intraclass correlation determines the gage classification.

- Intraclass correlation (no bias)
- Part / (Part + Test re-test error)
- Intraclass correlation (with bias)
- Part / (Part + Test re-test error + Operator)

- Bias impact
- Intraclass correlation (no bias) – Intraclass correlation (with bias)