Chart with control limits on which some statistical measure related to a series of samples is plotted in a particular order to steer the process with respect to that measure.
Notes: - The particular order is usually based on time or sample number order. Repeated sampling may be avoided where in-situ measurements are applicable.
- The control chart operates most effectively when the measure is a process variable which is correlated with an ultimate product or service characteristic.
- Examples of control charts are Shewhart means chart, Shewhart range chart, and cumulative sum control chart.
- Control charts are commonly used in the regular monitoring of the performance of a measurement procedure, as part of the laboratory's internal quality control.
Source:
PAC, 2021, 93, 997. 'Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)' on page 1023 (https://doi.org/10.1515/pac-2019-0819)