A free online reference for statistical process control, process capability analysis, measurement systems analysis, control chart interpretation, and other quality metrics.
The calculations for capability analysis are based on the following assumptions:
If these assumptions are not met, the results of a capability analysis will be misleading.
See also: >> How do I compare the Cp/Pp and Cpk/Ppk? >> Cp >> Cr >> Cpm >> Pp >> Cpk >> Ppk >> Capability indices