【英文标准名称】:StandardPracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWater
【原文标准名称】:D19水委员会应用试验方法的精确性及偏差测定的标准实施规范
【标准号】:ASTMD2777-2008e1
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:D19.02
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:collaborativestudy;detection;interlaboratorystudy;methodbias;methodprecision;methodrecovery;quantitation;round-robinstudy;statisticalanalysis;Youdenstudydesign;Accuracyassessment;ASTMCommitteeD-19onWater;Bias;Collaborativetest
【摘要】:Followingthispracticeshouldresultinprecision-and-biasstatementsthatcanbeachievedbyanylaboratoryproperlyusingthetestmethodstudied.Theseprecision-and-biasstatementsprovidethebasisforgenericlimitsforuseintheQualityControlsectionofthetestmethod.Optionally,thedetectionandquantitationvaluesprovideestimatesofthelevelatwhichmostlaboratoriesshouldbeabletoachieveconfidentdetectionandmeettheminimumprecision(expressedasrelativestandarddeviation)expected.Themethodspecifiesthematricesforwhichthetestmethodisappropriate.Thecollaborativetestcorroboratesthewrite-upwithinthelimitationsofthetestdesign.Anextensivetestcanonlyuserepresentativematricessothatuniversalapplicabilitycannotbeimpliedfromtheresults.Thefundamentalassumptionofthecollaborativestudyisthatthematricestested,theconcentrationstested,andtheparticipatinglaboratoriesarearepresentativeandfairevaluationofthescopeandapplicabilityofthetestmethodaswritten.1.1ThispracticeestablishesuniformstandardsforestimatingandexpressingtheprecisionandbiasofapplicabletestmethodsforCommitteeD19onWater.1.2Exceptasspecifiedin1.3,1.4,and1.5,thispracticerequiresthetaskgroupproposinganewtestmethodtocarryoutacollaborativestudyfromwhichstatementsforprecision(overallandsingle-operatorstandard-deviationestimates)andbiascanbedeveloped.Thispracticeprovidesgeneralguidancetotaskgroupsinplanningandconductingsuchdeterminationsofprecisionandbias.1.3Ifafull-scalecollaborativestudyisnottechnicallyfeasible,duetothenatureofthetestmethodorinstabilityofsamples,thelargestfeasiblescaled-downcollaborativestudyshallbeconductedtoprovidethebestpossiblelimitedbasisforestimatingtheoverallandsingle-operatorstandarddeviations.1.3.1Examplesofacceptablescaled-downstudiesarethelocal-areastudiesconductedbySubcommitteeD19.24onmicrobiologicalmethodsbecauseofinherentsampleinstability.Thesestudiesinvolvesixormorecompletelyindependentlocal-areaanalystswhocanbeginanalysisofuniformsamplesatanagreedupontime.1.3.2Ifuniformsamplesarenotfeasibleunderanycircumstances,astatementofsingle-operatorprecisionwillmeettherequirementsofthispractice.Wheneverpossible,thisstatementshouldbedevelopedfromdatageneratedbyindependentmultipleoperators,eachdoingreplicateanalysesonindependentsamples(ofaspecificmatrixtype),whichgenerallyfallwithinspecifiedconcentrationranges(see7.2.5.2(3)).1.3.3Thispracticeisnotapplicabletomethodologyinvolvingcontinuoussamplingorcontinuousmeasurement,orboth,ofspecificconstituentsandproperties.1.3.4Thispracticeisalsonotapplicabletoopen-channelflowmeasurements.1.4Acollaborativestudythatsatisfiedtherequirementsoftheversionofthispracticeinforcewhenthestudywasconductedwillcontinuetobeconsideredanadequatebasisfortheprecision-and-biasstatementrequiredineachtestmethod.Ifthestudydoesnotsatisfythecurrentminimumrequirementsforacollaborativestudy,astatementlistingthestudy''sdeficienciesandareferencetothisparagraphshallbeincludedintheprecision-and-biasstatementasthebasisforanexemptionfromthecurrentrequirements.1.5Thisparagraphrelatestospecialexemptionsnotclearlyacceptableunder1.3or1.4.WiththeapprovalofCommitteeD19ontherecommendationoftheResultsAdvisorandtheTechnicalOperationsSectionoftheExecutiveSubcommitteeofCommitteeD19,astatementgivingacompellingreasonwhycompliancewi......
【中国标准分类号】:C51
【国际标准分类号】:13_060_50
【页数】:19P.;A4
【正文语种】:英语