Shewhart range chart 

https://doi.org/10.1351/goldbook.08128
Shewhart control chart in which the ranges of measured quantity values are plotted against time.
Notes:
  1. The range is the greatest measured quantity value minus the least measured quantity value.
  2. Warning and action limits are given in tables (for example) as a function of the number of measured quantity values (n) taken to obtain the range and of the expected average range.
  3. Nordtest advises that for Shewhart range charts, the best samples to be used are test samples selected from among the samples to be analysed in that analytical run.
Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 1041 [Terms] [Paper]
Citation: 'Shewhart range chart' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08128 RIS BibTex EndNote
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