For example, you have 3 operators and 15 parts. Operator A measures parts
1-5 twice, Operator B measures parts 6-10 twice, and Operator C measures parts
11-15 twice. Each part is unique to each operator; therefore, no operators
measure the same part. To see an example, go to
Example of Nested Gage R&R Study.
Select parts from the entire range of your process to increase the
likelihood of having a good estimate of the part-to-part variation. For
example, do not measure consecutive parts, parts from a single shift or a
single production line, or parts from the reject pile.
Part is nested in Operator. Two factors are nested when each level of one
factor occurs with only one level of the other factor. For example, if two
operators measure two different, but similar, sets of parts, parts are nested
under operator, and is indicated by Part (Operator). For details, go to
Data considerations for Nested Gage R&R