ASTM_D_4467_-_94_2001.pdf

Designation:D 4467 94(Reapproved 2001)Standard Practice forInterlaboratory Testing of a Textile Test Method ThatProduces Non-Normally Distributed Data1This standard is issued under the fixed designation D 4467;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers design and analysis of interlabora-tory testing of a test procedure in the case where the resultingtest data are discrete variates or are continuous variates notnormally distributed.This practice applies to all such interlabo-ratory tests used to validate a test procedure.1.2 Analysis of interlaboratory test results permits valida-tion that the process of using the test method is in statisticalcontrol and provides the information required to write state-ments on precision and bias as directed in Practice D 2906.Italso gives the information for determining the number ofspecimens per unit in the laboratory sample as required inPractice D 2905.1.3 Precision statements for non-normally distributed datacan be written as a function of the level of the property ofinterest without an interlaboratory test if the underlying distri-bution is known and statistical control can be assumed.1.4 If the underlying distribution is unknown,the precisionof the test method can only be approximated.There are nogenerally accepted methods of making approximations of thissort.1.5 If statistical control cannot be assumed,then a mean-ingful precision statement cannot be written and the testmethod should not be used.1.6 This practice is intended for use with data from testmethods that cannot be properly modeled by a normal distri-bution.See Practices D 2904 and E 691 for applications thatcan be modeled by a normal distribution.1.7 This practice includes the following sections:SectionsScope1Referenced Documents2Terminology3Significance and Uses4General Considerations5Basic Statistical Design6Pilot-Scale Interlaboratory Test7Full-Scale Interlaboratory Test8Missing Data9Outlying Observations10Interpretation of Data11Plotting Results12Keywords13Pilot-Scale and Full-Scale Interlaboratory TestsAnnex A1Calculation of Chi-SquareAnnex A21.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 123 Terminology Relating to Textiles2D 2904 Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed Data2D 2905 Practice for Statements on Number of Specimensfor Textiles2D 2906 Practice for Statements on Precision and Bias forTextiles2D 4646 Test Method for 24-h Batch-Type Measurement ofContaminant Sorption by Soils and Sediments3D 4853 Guide for Reducing Test Variability4E 456 Terminology Relating to Quality and Statistics5E 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method5E 1169 Guide for Conducting Ruggedness Tests53.Terminology3.1 Definitions:3.1.1 test method,na definitive procedure for the identi-fication,measurement,and evaluation of one or more qualities,characteristics,or properties of a material,product,system,orservice that produces a test result.3.1.2 For definitions of textile and statistical terms used inthis practice and discussions of their use,refer to TerminologyD 123,and Terminology E 456.3.2 Definitions of Terms Specific to This Standard:3.2.1 assignable causea factor which contributes to varia-tion and is feasible to detect and identify.3.2.2 interlaboratory testingthe evaluating of a test1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.93 on Statistics.Current edition approved June 15,1994.Published August 1994.Originallypublished as D 4467 85.Last previous edition D 4467 85.2Annual Book of ASTM Standards,Vol 07.01.3Annual Book of ASTM Standards,Vol 11.04.4Annual Book of ASTM Standards,Vol 07.02.5Annual Book of ASTM Standards,Vol 14.02.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.method in more than one laboratory by analyzing data obtainedfrom one or more materials that are as homogeneous aspractical.3.2.3 random causeone of many factors which contributeto variation but which are not feasible to detect and identifysince they are random in origin and usually small in effect.3.2.4 state of statistical controla condition in which aprocess,including a measurement process,is subject only torandom variation.4.Significance and Use4.1 The planning of interlaboratory tests requires a generalknowledge of statistical principles.Interlaboratory t