Confidence
Limits for Capability Index Cpk
The confidence limits for
the Capability Index Cpk may be calculated
as follows:
where n is the subgroup size. This calculated value
may be added and subtracted from the calculated Cpk index to indicate the
range of values for Cpk expected from random samples of a stable process.
where n is the subgroup size.
This calculated value
may be added and subtracted from the calculated Cpk index to indicate the
range of values for Cpk expected from random samples of a stable process.