1、Designation: E 2489 06e1An American National StandardStandard Practice forStatistical Analysis of One-Sample and Two-SampleInterlaboratory Proficiency Testing Programs1This standard is issued under the fixed designation E 2489; the number immediately following the designation indicates the year ofor
2、iginal 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.e1NOTEEq 4 was corrected editorially in August 2006.1. Scope1.1 This pra
3、ctice describes methods for the statistical analy-sis of laboratory results obtained from interlaboratory profi-ciency testing programs. As per Practice E 1301, proficiencytesting is the use of interlaboratory comparisons for thedetermination of laboratory testing or measurement perfor-mance. Conver
4、sely, collaborative study (or collaborative trial)is the use of interlaboratory comparisons for the determinationof the performance characteristics of a method, as covered byPractice E 691.1.1.1 Method A covers testing programs using single testresults obtained by testing a single sample (each labor
5、atorysubmits a single test result).1.1.2 Method B covers testing programs using paired testresults obtained by testing two samples (each laboratorysubmits one test result for each of the two samples). The twosamples should be of the same material or two materials similarenough to have approximately
6、the same degree of variation intest results.1.2 Methods A and B are applicable to proficiency testingprograms containing a minimum of 10 participating laborato-ries.1.3 The methods provide direction for assessing and catego-rizing the performance of individual laboratories based on therelative likel
7、ihood of occurrence of their test results, and fordetermining estimates of testing variation associated withrepeatability and reproducibility.1.4 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
8、 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:2E 177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE 178 Practice for Dealing With Outlying ObservationsE 4
9、56 Terminology Relating to Quality and StatisticsE 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE 1301 Guide for Proficiency Testing by InterlaboratoryComparisons2.2 ISO Standard:ISO 13528 Statistical Methods for Use in Proficiency Test-ing by Interl
10、aboratory Comparisons33. Terminology3.1 DefinitionsThe terminology defined in TerminologyE 456 applies to this practice unless modified herein.3.1.1 collaborative study, ninterlaboratory study in whicheach laboratory uses the defined method of analysis to analyzeidentical portions of homogeneous mat
11、erials to assess theperformance characteristics obtained for that method of analy-sis.43.1.2 collaborative trial, nsee collaborative study.3.1.3 interlaboratory comparison, norganization, perfor-mance, and evaluation of tests on the same or similar test itemsby two or more laboratories in accordance
12、 with predeterminedconditions.3.1.4 median, nmiddle value of a data set when the data isarranged in order of size or the average of the middle twovalues when there is an even number of items in the data set.1This practice is under the jurisdiction of ASTM Committee E11 on Quality andStatistics and i
13、s the direct responsibility of Subcommittee E11.20 on Test MethodEvaluation and Quality Control.Current edition approved May 1, 2006. Published May 2006.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSt
14、andards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.4Horwitz, W., “Protocol for the Design, Conduct and Interpretation of Collabo-rative Studies,” Pure c
15、ollaborative trial; interlaboratorycomparison; proficiency testingTABLE 8 Summary of Results for Samples X and Y for Two-Sample ProgramLabSample XTest ResultBetween-LaboratoryCategory for Sample XSample YTest ResultBetween-LaboratoryCategory for Sample YRandom Error Quantities(X-Y)-(Xmed-Ymed)Within
16、-LabCategory1 1.22 Typical 1.26 Typical -0.15 Typical2 1.62 Typical 1.91 Typical -0.40 Typical3 1.82 Typical 1.20 Typical 0.51 Typical4 0.60 Typical 1.00 Typical -0.51 Typical5 2.75 Unusual 2.41 Unusual 0.23 Typical6 1.55 Typical 1.26 Typical 0.18 Typical7 1.17 Typical 1.57 Typical -0.51 Typical8 1.
17、76 Typical 1.28 Typical 0.37 Typical9 1.35 Typical 0.93 Typical 0.31 Typical10 1.18 Typical 1.21 Typical -0.14 Typical11 1.19 Typical 1.26 Typical -0.18 Typical12 1.71 Typical 0.42 Unusual 1.18 Unusual13 2.03 Typical 2.21 Typical -0.29 Typical14 1.10 Typical 1.33 Typical -0.34 Typical15 1.84 Typical
18、 1.81 Typical -0.08 Typical16 1.39 Typical 1.12 Typical 0.16 Typical17 1.13 Typical 1.08 Typical -0.06 Typical18 1.66 Typical 1.45 Typical 0.10 Typical19 1.28 Typical 1.20 Typical -0.03 Typical20 1.24 Typical 0.71 Typical 0.42 Typical21 0.69 Typical 0.77 Typical -0.19 Typical22 1.54 Typical 1.39 Typ
19、ical -0.04 Typical23 1.43 Typical 1.52 Typical -0.20 Typical24 0.84 Typical 1.27 Typical -0.54 Typical25 0.98 Typical 0.99 Typical -0.12 Typical26 1.97 Typical 2.24 Typical -0.38 Typical27 4.89 Extremely Unusual 5.28 Extremely Unusual -0.50 Typical28 1.85 Typical 1.78 Typical -0.04 Typical29 1.09 Ty
20、pical 1.20 Typical -0.22 Typical30 1.07 Typical 1.24 Typical -0.28 TypicalPrecision Estimates for Two-Sample Program Data Shown AboveReproducibility Standard Deviation for SampleX=0.467Reproducibility Standard Deviation for Sample Y = 0.333Pooled Reproducibility Standard Deviation, sR= 0.406Repeatab
21、ility Standard Deviation, sr= 0.236E248906e112ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, a
22、nd the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revis
23、ion of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you s
24、houldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).E248906e113
