caa a22 4500 605465703 CHVBK 20210128100303.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00769-015-1117-4 doi (NATIONALLICENCE)springer-10.1007/s00769-015-1117-4 Construction and application of the robust Youden plot in an EQA program [Elektronische Daten] [Qi Zhou, Jihong Hu, Xiaopeng Li, Shaonan Li, Zhenxiang Gao, Jianping Xu, Wei Xie] The Youden plot is a method of graphical data analysis used in inter-laboratory comparisons. The confidence ellipse of a traditional Youden plot can be distorted by non-normally distributed data. In this study, a robust Youden plot is constructed based on robust statistical parameters since these are scarcely affected by non-normally distributed data and this approach is applied in an external quality assessment (EQA) program. We consider the robust between-laboratory z-scores (z b,i ) and within-laboratory z-scores (z w,i ) obtained by the participants of EQA schemes regarding glucose concentration measurement results and their locations relative to the confidence ellipse in a robust Youden plot. It turned out that 98.1% of the acceptable results (|z b,i |≤2 as well as |z w,i |≤2) are located inside the ellipse and that 92.9% of questionable results with z-scores between 2 and 3 are located on or near the ellipse; while all the unacceptable results (at least one z-score equal to or larger than 3) are located outside the ellipse. These results indicate that, in an EQA program, it is reasonable to choose robust statistical techniques to construct the Youden plot and robust z-scores, in order to illustrate and assess the EQA data. Springer-Verlag Berlin Heidelberg, 2015 Data distribution nationallicence EQA nationallicence Robust statistical method nationallicence Robust Youden plot nationallicence Robust z -score nationallicence Zhou Qi National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut Hu Jihong National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut Li Xiaopeng National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut Li Shaonan National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut Gao Zhenxiang National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut Xu Jianping National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut Xie Wei National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut Accreditation and Quality Assurance Springer Berlin Heidelberg 20/3(2015-06-01), 195-201 0949-1775 20:3<195 2015 20 769 https://doi.org/10.1007/s00769-015-1117-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00769-015-1117-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhou Qi National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Hu Jihong National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Li Xiaopeng National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Li Shaonan National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Gao Zhenxiang National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Xu Jianping National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Xie Wei National Center for Clinical Laboratories, Beijing Hospital, 1. Da Hua Road, 100730, Beijing, People's Republic of China aut NATIONALLICENCE 773 0- Accreditation and Quality Assurance Springer Berlin Heidelberg 20/3(2015-06-01), 195-201 0949-1775 20:3<195 2015 20 769