Designation:E2554−13AnAmericanNationalStandardStandardPracticeforEstimatingandMonitoringtheUncertaintyofTestResultsofaTestMethodUsingControlChartTechniques1ThisstandardisissuedunderthefixeddesignationE2554;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribestechniquesforalaboratorytoestimatetheuncertaintyofatestresultusingdatafromtestresultsonacontrolsample.ThisstandardprovidesonemethodforalaboratorytoestimateMeasurementUncertaintyinaccordancewithSectionA22.3inFormandStyleofASTMStandards.1.2Uncertaintyasdefinedbythispracticeappliestothecapabilitiesofasinglelaboratory.Anyestimateofuncertaintydeterminedthroughtheuseofthispracticeappliesonlytotheindividuallaboratoryforwhichthedataarepresented.1.3Thelaboratoryusesawelldefinedandestablishedtestmethodindeterminingaseriesoftestresults.Theuncertaintyestimatedusingthispracticeonlyapplieswhenthesametestmethodisfollowed.Theuncertaintyonlyappliesforthematerialtypesrepresentedbythecontrolsamples,andmultiplecontrolsamplesmaybeneeded,especiallyifthemethodhasdifferentprecisionfordifferentsampletypesorresponselevels.1.4Theuncertaintyestimatedeterminedbythispracticerepresentstheintermediateprecisionoftestresults.Thisestimateseekstoquantifythetotalvariationexpectedwithinasinglelaboratoryusingasingleestablishedtestmethodwhileincorporatingasmanyknownsourcesofvariationaspossible.1.5Thispracticedoesnotestablisherrorestimates(errorbudget)attributedtoindividualfactorsthatcouldinfluenceuncertainty.1.6Thispracticedescribestheuseofcontrolchartstoevaluatethedataobtainedandpresentsaspecialtypeofcontrolcharttomonitortheestimateofuncertainty.1.7Thesystemofunitsforthisstandardisnotspecified.Dimensionalquantitiesinthestandardarepresentedonlyasillustrationsofcalculationmethods.Theexamplesarenotbindingonproductsorte...
