caa a22 4500 605466009 CHVBK 20210128100305.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00769-015-1160-1 doi (NATIONALLICENCE)springer-10.1007/s00769-015-1160-1 Introduction of z -score arrow ranges (ZSAR) in proficiency testing [Elektronische Daten] [Kees van Putten, Robert-Jan Lamers] Most proficiency testing (PT) providers do not calculate the performance of participants that report results that are below the limit of quantification, so-called truncated results ("< results"). The ISO FDIS 13528 standard describes three approaches for the analysis of censored data. DUCARES leaves out truncated results from the statistical evaluation. Although these results are removed from the statistical dataset, it is possible, however, to give a performance indication with z-score ranges. For this, DUCARES has developed the graphical z-score arrow range (ZSAR) method which considers the full interval of potentially possible results as described by the truncated value <x reported by a laboratory, i.e., from the limit value x down to zero. The ZSAR method translates this into a z-score interval and displays it graphically with a double-headed arrow in the distribution plot. This presentation gives the participating laboratory a good indication whether its reported truncated value potentially includes satisfactory scores |z|≤2 or not, and to decide on corrective actions. In this paper, we present the ZSAR method and discuss its advantages in PT. Springer-Verlag Berlin Heidelberg, 2015 ZSAR method nationallicence Truncated values nationallicence Proficiency testing nationallicence ISO 13528 nationallicence van Putten Kees DUCARES B.V., P.O. Box 40237, 3504 AA, Utrecht, The Netherlands aut Lamers Robert-Jan Abundnz B.V., Jaap Bijzerweg 19, 3446 CR, Woerden, The Netherlands aut Accreditation and Quality Assurance Springer Berlin Heidelberg 20/5(2015-10-01), 355-358 0949-1775 20:5<355 2015 20 769 https://doi.org/10.1007/s00769-015-1160-1 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/s00769-015-1160-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- van Putten Kees DUCARES B.V., P.O. Box 40237, 3504 AA, Utrecht, The Netherlands aut NATIONALLICENCE 700 1- Lamers Robert-Jan Abundnz B.V., Jaap Bijzerweg 19, 3446 CR, Woerden, The Netherlands aut NATIONALLICENCE 773 0- Accreditation and Quality Assurance Springer Berlin Heidelberg 20/5(2015-10-01), 355-358 0949-1775 20:5<355 2015 20 769