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A study on the utilization of the Youden plot to evaluate proficiency test results |
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| Authors: | Katsuhiro Shirono Kosei Iwase Hiroshi Okazaki Masaru Yamazawa Kazuhiro Shikakume Natsuo Fukumoto Masashi Murakami Masaaki Yanagisawa Takahisa Tsugoshi |
| Institution: | 1. National Institute of Advanced Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan 2. Yokohama College of Pharmacy, Yokohama, Kanagawa, Japan 3. Japan Science and Technology Agency, Fukuoka, Fukuoka, Japan 4. Chemicals Evaluation and Research Institute, Japan, Kitakatsushika-gun, Saitama, Japan 5. Sumika Chemical Analysis Service, Ltd., Sodegaura, Chiba, Japan 6. Unichemy Co. Ltd., Nagoya, Aichi, Japan |
| Abstract: | Methods of utilizing the Youden plot obtained from interlaboratory comparison tests are proposed. The Youden plot is a powerful tool for visually evaluating between- or within-laboratory errors. However, there are no generally applicable methods to indicate the anomalies in the between- and the within-laboratory errors in qualitative terms. An evaluation frame was therefore developed in this study as an indication method. Moreover, the Youden plot is considered to be useful for visually assessing the comprehensive performance of laboratories using two types of results. Although the confidence ellipse has been proposed in ISO 13528:2005 for this purpose, robust determination of the parameters has not yet been implemented. In the present study, robust determination of one of the parameters, the correlation coefficient, was developed. Our proposals were analytically validated using two types of statistical models. In addition, the properties were evaluated through computational simulations. From the results obtained, it can be concluded that our proposals are practically applicable to actual interlaboratory comparison tests. |
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