![]() ![]() We will use a system for measuring film thickness from the microelectronics industry for illustration. To help more quality practitioners reap the benefits of this powerful tool, let’s take a step-by-step look at how to design, analyze and interpret the results of an Expanded Gage R&R Study. In using Expanded Gage R&R to evaluate systems for a wide range of measurement types-from surface roughness to coating thickness-we have learned that simply running a separate standard gage R&R at each of the levels of the extra variable is rarely an efficient design for answering the questions of interest. ![]() For example, reducing the number of parts from 10 to five is a common approach.Īn Expanded Gage R&R tool can help companies implement Expanded Gage studies to correctly assess their measurement system and improve quality. The sampling plan for the expanded study will quickly grow beyond a reasonable size and will require reducing the sample size of at least one variable. The interactions of the additional factors with operator and part can also be evaluated. Unlike the standard study, missing data points are allowed in the analysis for an expanded study. The expanded study allows additional factors such as gage, laboratory and location to be evaluated in addition to operator and part. The four main differences between a standard and an expanded study are:
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