Designation:D8146−18AnAmericanNationalStandardStandardGuideforEvaluatingTestMethodCapabilityandFitnessforUse1ThisstandardisissuedunderthefixeddesignationD8146;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverstechniquesforevaluatingthestatisti-calcapabilityandfitnessforuseofstandardtestmethodsusedformeasuringpropertiesofpetroleumproducts,liquidfuels,andlubricants.Specifically,thisguideprovidesstrategiesforevaluatingthecapabilityofatestmethodtoprovideasufficientlypreciseestimateoftheintendedparameterversusagivenlevelorvalueofthatparameterandforassessing,withsufficientconfidence,thefitnessforuseofatestmethodfordeterminingtheacceptabilityofproductsversusspecification,regulatory,ormanufacturinglimits.1.2Theassessmentofcapabilityinthisguideisapplicabletotestmethodsthatalwaysyieldnon-negativenumericalresultsandhaveahard,fixedzerolowerlimitorfixedupperlimit(forexample,100%).Detailedknowledgeofatestmethodandprofessionaljudgementmayberequiredindeter-miningtheapplicabilityofthisguidetocertaintestmethods.1.3Inaccordancewiththisguide,theassessmentoffitnessforuseofatestmethodversusspecification,regulatory,ormanufacturinglimitsisgenerallyapplicabletotestmethodsthatprovidenumericalresultsandhaveapplicablereproduc-ibilityprecisionvalues.1.4Thisguideisintendedforusebytestmethoddevelopers,specificationsetters,andlaboratoriesselectingtestmethodstoevaluateproductsforspecificpurposesorversusspecificlimits.1.5Thisguideisnotapplicabletotestmethodsthatmeasuretemperaturetodeterminepropertiessuchas,butnotlimitedto,freezepoint,pourpoint,flashpoint,anddistillations.Thisguideisnotintendedforusebylaboratoriesforevaluatinglaboratorytestmethodexecutioncapability,norisitintendedtoevaluatemanufacturingprocesscapability.1.6Theexpressionsofcapabilityandfitnessforusederi...
