A free online reference for statistical process control, process capability analysis, measurement systems analysis, control chart interpretation, and other quality metrics.
Tools for analyzing and interpreting data so that areas to improve become apparent.
Consists of measurements of a characteristic, such as length, weight, density, time, or pressure.
Consists of defects per item (nonconformities) or the number of defective items (nonconforming). For example, the number of non-working parts in sample or the number of blemishes counted on an individual part.
Consists of a count of items or occurrences, such as the number of defective items, the number of scratches on a door panel, or how often a specific problem occurs.
Use this when other control charts are not effective to determine if your process is stable.
Answer “yes” or “no” to a series of questions about your control charts.
Follow these steps to interpret histograms.