
16 Control Chart Platform Phases 375
16 Quality Control with Control Charts
Phases
A phase is a group of consecutive observations in the data table. For example, phases might correspond
to time periods during which a new process is brought into production and then put through successive
changes. Phases generate, for each level of the specified Phase variable, a new sigma, set of limits, zones,
and resulting tests.
On the launch window for -, r-, s-, IR-, p-, np-, c-, and u-charts, a
Phase variable button appears. If a
phase variable is specified, the phase variable is examined, row by row, to identify to which phase each
row belongs.
Example
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