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Monitoring Within-Piece Variability on a Control Chart

The 3D chart is the correct tool for evaluating within-piece and piece-to-piece variability on a single chart. Placing within-piece variation data on a traditional X-bar and range chart violates rational sampling procedures and invalidates calculation and interpretation of control limits and process capability ratios.

Tech NoteUse the Proper Method for Monitoring Batch Processes
When monitoring solution characteristics from chemical batches there are three sources of variation - average over time, within-batch and batch-to-batch. This Tech Note contains an example with mixing paint.
Tech NoteSPC for True Position
Applying SPC to true position involves two issues: 1) the control aspect and 2) capability ratios. ProFicient manages both.
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