A nested Gage R&R can be useful for studying destructive measurements. As obtaining a measurement destroys the sample being measured, repeating and reproducing measurements on the same item is not possible.
A nested Gage study depends on the ability to be able to use groups of samples that, if not identical, are at least similar.
The worksheet Gage nested
contains a dataset loosely based around breaking the strength of a block of chocolate. A block of chocolate is assumed to be homogenous and is split into three identical bars. 12 blocks of chocolate are divided among the two operators with six blocks per operator. Each operator measures all the bars within its set of six blocks.
We will use the Gage R&R Study (Nested) option to investigate the measurement system error and sample variation.