ASTM_D_7372_-_12.pdf

Designation:D737212An American National StandardStandard Guide forAnalysis and Interpretation of Proficiency Test ProgramResults1This standard is issued under the fixed designation D7372;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This guide covers the analysis and interpretation ofproficiency test(PT)program results.For participants ininterlaboratory proficiency test(PT)(or crosscheck,checkscheme,etc.)programs,this guide describes procedures forassessing participants results relative to the PT programresults and potentially improving the laboratorys testingperformance based on the assessment findings and insights.Forthe committees responsible for the test methods included ininterlaboratory proficiency testing programs,this guide de-scribes procedures for assessing industrys ability to performtest methods and for potentially identifying needs for methodimprovement.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1266 Test Method for Sulfur in Petroleum Products(LampMethod)D2622 Test Method for Sulfur in Petroleum Products byWavelength Dispersive X-ray Fluorescence SpectrometryD4294 Test Method for Sulfur in Petroleum and PetroleumProducts by Energy Dispersive X-ray Fluorescence Spec-trometryD4951 Test Method for Determination of Additive Elementsin Lubricating Oils by Inductively Coupled PlasmaAtomic Emission SpectrometryD5185 Test Method for Multielement Determination ofUsed and Unused Lubricating Oils and Base Oils byInductively Coupled Plasma Atomic Emission Spectrom-etry(ICP-AES)D5453 Test Method for Determination of Total Sulfur inLight Hydrocarbons,Spark Ignition Engine Fuel,DieselEngine Fuel,and Engine Oil by Ultraviolet FluorescenceD6259 Practice for Determination of a Pooled Limit ofQuantitationD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6617 Practice for Laboratory Bias Detection Using SingleTest Result from Standard MaterialD6792 Practice for Quality System in Petroleum Productsand Lubricants Testing LaboratoriesD7039 Test Method for Sulfur in Gasoline,Diesel Fuel,JetFuel,Kerosine,Biodiesel,BiodieselBlends,andGasoline-Ethanol Blends by Monochromatic WavelengthDispersive X-ray Fluorescence SpectrometryE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and StatisticsE2655 Guide for Reporting Uncertainty of Test Results andUse of the Term Measurement Uncertainty in ASTM TestMethods3.Terminology3.1 Definitions:3.1.1 accuracy,ncloseness of agreement between an ob-served value and an accepted reference value.E177,E4563.1.2 assignable cause,nfactor that contributes to varia-tion and that is feasible to detect and identify.E4563.1.3 bias,nsystematic error that contributes to the differ-ence between a population mean of the measurements or testresults and an accepted reference or true value.E177,E4563.1.4 control limits,nlimits on a control chart that areused as criteria for signaling the need for action or for judgingwhether a set of data does or does not indicate a state ofstatistical control.E4563.1.5 in-statistical-control,adjprocess,analytical mea-surement system,or function that exhibits variations that canonly be attributable to common cause.D62991This guide is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.94 on Coordinating Subcommittee on Quality Assurance and Statistics.Current edition approved April 15,2012.Published October 2012.Originallyapproved in 2007.Last previous edition approved in 2007 as D737207.DOI:10.1520/D7372-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.6 InterlaboratoryCrosscheckProgram(ILCP),nASTM International Proficiency Test Program sponsoredby Committee D02 on Petroleum Products and Lubricants,seeASTM website for current details.3.1.7 proficiency testing,ndetermination of a laboratorystesting capability by participation in an interlaboratory cross-check programD62993.1.8 uncertainty,nan indication of the magnitude of errorassociat