Transcription of Repeatability and Reproducibility - Engineered Software
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Repeatability and Reproducibility - Engineered Software
Repeatability and ReproducibilityCopyright 1999 by Engineered Software , is the variability of the measurements obtained by one person whilemeasuring the same item repeatedly. This is also known as the inherent precision of themeasurement equipment. Consider the probability density functions shown in Figure density functions were constructed from measurements of the thickness of a piece ofmetal with Gage A and Gage B. The density functions demonstrate that Gage B is morerepeatable than Gage AGage BFigure 1. Probability density functions for the thickness of 2 is the variability of the measurement system caused bydifferences in operator behavior. Mathematically, it is the variability of the averagevalues obtained by several operators while measuring the same item. Figure 2 displaysthe probability density functions of the measurements for three operators.
design used is a two-way, fixed effects model with replications. The ANOVA table is shown in Table 5. Table 5. Two-Way ANOVA Table. Source of Variation Sum of Square s Degrees of Freedom Mean Square F Statistic Appraiser SSA a-1 MSA SSA a = −1 F MSA MSE = Parts SSB b-1 MSB SSB b = −1 F MSB MSE = Interaction (Appraiser, Parts) SSAB (a-1)(b-1 ...
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