Measurement Systems Analysis

Measurement systems are essential to the quality of a manufacturing process. The instruments that take measurements are subject to variation. Therefore, the variation in measured quantities consists of the variation in the product that is being measured plus the variation in the measurement system. Too much variation in the measurement system can mask variation in the manufacturing process.

The SAS autocall macro library provides two macros for gauge repeatability and reproducibility (R&R) and two macros for evaluating the measurement process (EMP). Both of these methods examine the precision (reproducibility), consistency (repeatability) and bias of a measurement system. This appendix describes the syntax for the macros and provides simple examples that show how they are used. See Wheeler (2006) for a thorough discussion of evaluating the measurement process.