caa a22 4500 605465991 CHVBK 20210128100305.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00769-015-1173-9 doi (NATIONALLICENCE)springer-10.1007/s00769-015-1173-9 Comparison of different approaches used for the interpretation and presentation of PT results [Elektronische Daten] [Aida Jotanovic, Semsa Suljagic] The laboratory for precious metals within the Institute of Metrology of Bosnia and Herzegovina acts as a state reference laboratory in the field of quality control of articles manufactured of precious metals, e.g. jewellery. It disseminates reference values through the organisation of proficiency testing (PT) schemes. Two separate PT schemes for the determination of mass fraction of gold in typical jewellery alloys were conducted in 2013 and 2014. Laboratories taking part in these PT schemes are affiliated to the National Metrology Institutes of several countries and two private goldsmith laboratories. Different approaches in the design of the PT schemes and the evaluation of the PT results were used with the purpose of exploring their features regarding the interpretation of the results. For PT.13, z-scores were used as laboratory performance indicators. The assigned value and the standard deviation for proficiency assessment were calculated from the results of the participating laboratories by applying robust statistic. z-score and z′-score were used as performance indicators for the scheme PT.14, and the assigned value of the test sample and its measurement uncertainty were determined by the PT provider. The standard deviation of the testing method of 0.5mg/g as prescribed in ISO 11426 as fit for purpose in the field of interest is used as standard deviation for proficiency assessment σ p. By comparing the z-scores and z′-scores assigned to the PT.14 results, it is evident that the measurement uncertainty of the assigned value provided by the PT provider does not affect the overall successfulness of the participants. The Q-score based on relative deviation was used as an alternative approach to identify future partners in PT schemes with the purpose of reference value assignment (Q≤0.05). Springer-Verlag Berlin Heidelberg, 2015 PT schemes nationallicence Assigned value nationallicence z -score nationallicence z ′-score nationallicence Q -score nationallicence Gold alloy nationallicence Jotanovic Aida Institute of Metrology of Bosnia and Herzegovina - IMBIH, Dolina 6, Sarajevo, Bosnia and Herzegovina aut Suljagic Semsa Institute of Metrology of Bosnia and Herzegovina - IMBIH, Dolina 6, Sarajevo, Bosnia and Herzegovina aut Accreditation and Quality Assurance Springer Berlin Heidelberg 20/5(2015-10-01), 395-399 0949-1775 20:5<395 2015 20 769 https://doi.org/10.1007/s00769-015-1173-9 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/s00769-015-1173-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jotanovic Aida Institute of Metrology of Bosnia and Herzegovina - IMBIH, Dolina 6, Sarajevo, Bosnia and Herzegovina aut NATIONALLICENCE 700 1- Suljagic Semsa Institute of Metrology of Bosnia and Herzegovina - IMBIH, Dolina 6, Sarajevo, Bosnia and Herzegovina aut NATIONALLICENCE 773 0- Accreditation and Quality Assurance Springer Berlin Heidelberg 20/5(2015-10-01), 395-399 0949-1775 20:5<395 2015 20 769