ISO INTERNATIONAL STANDARD 13528 Third edition 2022-08 Statistical methods for use in proficiency testing by interlaboratory comparison Methodes statistiques utilisées dans les essais d'aptitude par comparaison interlaboratoires Reference number IS0 13528:2022(E) ISO @IS02022 IS0 13528:2022(E) COPYRIGHTPROTECTED DOCUMENT @IS02022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either Iso at the address below or Iso's memberbody inthe country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 0111 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii IS02022-Allrightsreserved