Assessing Measurement System Variation
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چکیده
Example 1: Fuel Injector Nozzle Diameters Problem A manufacturer of fuel injector nozzles installs a new digital measuring system. Investigators want to determine how well the new system measures the nozzles. Data set Nozzle.MPJ Description Variable Fuel injector nozzle measured Nozzle Data collection Technicians randomly sample, across all major sources of process variation (machine, time, shift, job change), 9 nozzles that represent those that are typically produced. They code Operator who measured Operator Original run order of the experiment Run Order Measured diameter of nozzle (microns) Diam the nozzles to identify the measurements taken on each nozzle. The first operator measures the 9 nozzles in random order. Then, the second operator measures the 9 nozzles in a different random order. Each operator repeats the process twice, for a total of 36 measurements.
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