| Title: |
THE INFLUENCE OF THE ASSIGNED VALUE IN THE ASSESSMENT OF TEST PERFORMANCE. |
| Authors: |
ȘERBANCEA, Floarea1, NENCIU, Florin2, STĂNESCU, Aurelia3, ȘERBANCEA, Cristian1 |
| Source: |
Annals of the Faculty of Engineering Hunedoara - International Journal of Engineering. Aug2023, Vol. 21 Issue 3, p175-180. 6p. |
| Subject Terms: |
*EXPERIMENTAL design, *FLOUR, *STANDARD deviations, *TESTING laboratories |
| Abstract: |
According to clause 4.4 of the ISO 17043:2010 standard, the development of the statistical project is of particular importance in the competence testing process. The criteria used in choosing the type of statistical design are clearly stated in ISO 17043 and their implementation depends on the proficiency testing provider. According to ISO 13528:2015, it is important that the statistical design is appropriate for the type and purpose of the proficiency testing scheme (PT). Entities participating in PT, according to ISO 17025:2018, must be aware of the statistical project from the stage of registration to the scheme. The aim of the study was to identify the effect produced by the choice of the assigned value in the calculation of the performance indicator of a laboratory when using the same test object. The paper presents the influence of the assigned value in the evaluation of the testing performance of laboratories according to the recommendations of the international standard ISO 13528 regarding the statistical calculation of the z–score. The study was carried out by simulating the z–score for a number of 30 participants who analyzed the ash content of wheat flour. The z–score was calculated for two assigned values (CRM value and consensus value). For the same standard deviation, significant differences were found between the z–score values. [ABSTRACT FROM AUTHOR] |
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| Database: |
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