ISO13528providesstatisticalmethodsandproceduresforanalyzingdatainproficiencytestingschemesinvolvinginterlaboratorycomparisons.Thestandardcoverskeyaspectssuchasperformanceevaluation,outlierdetection,consensusvaluedetermination,anduncertaintyestimation.Itincludesrobuststatisticaltechniquestoensurereliableresultsevenwhendatacontainsanomaliesornon-normaldistributions.Themethodsoutlinedaredesignedtoassesslaboratorycompetenceobjectivelyandconsistentlyacrossvarioustestingfields.Thestandardalsoaddressescalculationofz-scoresandotherperformanceindicatorstofacilitateuniforminterpretationofproficiencytestingoutcomes.Thesestatisticaltoolshelporganizersevaluateparticipantperformancewhileaccountingformeasurementvariabilityinherentininterlaboratorystudies.
