Youden plot

https://doi.org/10.1351/goldbook.08140
Graphical technique for evaluating an interlaboratory comparison when each participant has made two measurements on the same sample or one measurement on each of two different samples.
Notes:
  1. The coordinates of each point may be the measured quantity values themselves or any transformation thereof such as a performance score, for example, a z score (see Fig. 1).
  2. The Youden plot is a simple but effective method for comparing both within-laboratory variability and between-laboratory variability.

Figure 1: Youden plot of the z scores of samples #9 and #10 of Round 5 of U39 of the proficiency testing program held by the RCPA Australia for the analysis of creatinine in urine by 218 laboratories. (Reproduced with permission).

Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 1043 [Terms] [Paper]
Citation: 'Youden plot' 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.08140 RIS BibTex EndNote
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