【英文标准名称】:StandardPracticeforStatisticalAssessmentandImprovementofExpectedAgreementBetweenTwoTestMethodsthatPurporttoMeasuretheSamePropertyofaMaterial
【原文标准名称】:测量材料相同性质的两种试验方法间预期一致性的统计学评估和改进用标准实施规程
【标准号】:ASTMD6708-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D02.94
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:协议;评估;改进;材料特性;材料试验;统计;统计学;试验方法;测试
【英文主题词】:Agreement(testingmethods);Bias;Cross-methodreproducibility;Interlaboratorytesting;Linearbiascorrection;Quantifieddata;Statisticalmethods--petroleum;Testingmethods
【摘要】:Thispracticecanbeusedtodetermineifaconstant,proportional,orlinearbiascorrectioncanimprovethedegreeofagreementbetweentwomethodsthatpurporttomeasurethesamepropertyofamaterial.Thebiascorrectiondevelopedinthispracticecanbeappliedtoasingleresult(X)obtainedfromonetestmethod(methodX)toobtainapredictedresult(x02C6;Y)fortheothertestmethod(methodY).Note78212;Usersarecautionedtoensurethatx02C6;YiswithinthescopeofmethodYbeforeitsuse.Thebetweenmethodsreproducibilityestablishedbythispracticecanbeusedtoconstructanintervalaroundx02C6;YthatwouldcontaintheresultoftestmethodY,ifitwereconducted,withabout95%confidence.Thispracticecanbeusedtoguidecommercialagreementsandproductdispositiondecisionsinvolvingtestmethodsthathavebeenevaluatedrelativetoeachotherin1.1Thispracticecoversstatisticalmethodologyforassessingtheexpectedagreementbetweentwostandardtestmethodsthatpurporttomeasurethesamepropertyofamaterial,anddecidingifasimplelinearbiascorrectioncanfurtherimprovetheexpectedagreement.ItisintendedforusewithresultscollectedfromaninterlaboratorystudymeetingtherequirementofPracticeD6300orequivalent(forexample,ISO4259).Theinterlaboratorystudymustbeconductedonatleasttenmaterialsthatspantheintersectingscopesofthetestmethods,andresultsmustbeobtainedfromatleastsixlaboratoriesusingeachmethod.Note18212;ExamplesofstandardtestmethodsarethosedevelopedbyvoluntaryconsensusstandardsbodiessuchasASTM,IP/BSI,DIN,AFNOR,CGSB.1.2Thestatisticalmethodologyisbasedonthepremisethatabiascorrectionwillnotbeneeded.Intheabsenceofstrongstatisticalevidencethatabiascorrectionwouldresultinbetteragreementbetweenthetwomethods,abiascorrectionisnotmade.Ifabiascorrectionisrequired,thentheparsimonyprincipleisfollowedwherebyasimplecorrectionistobefavoredoveramorecomplexone.