2 Analysis – Average and Range Method

Module 3 Gage R&R Studies

Lesson M3-02

Text: Section 2, pages 5 – 15

Duration: 27 minutes

Analysis – Average and Range Method

We review a basic calculation worksheet for using the average and range method to estimate measurement error components.  Understanding the calculations helps us understand how we isolate repeatability variation and calculate reproducibility.  In this method, specific ranges are calculated and then used to estimate standard deviations.  An example illustrates the calculations of the normal metrics.  We end with a review of the guidelines for acceptance and a discussion of possible causes of poor repeatability and/or poor reproducibility.

Downloads

Gage R&R Worksheet (Excel xls format)