D 2777 – 03 ;RDI3NZC.doc
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2、n American National StandardStandard Practice forDetermination of Precision and Bias of Applicable TestMethods of Committee D19 on Water1This standard is issued under the fixed designation D 2777; the number immediately following the designation indicates the year oforiginal adoption or, in the case
3、 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 establishes uniform standards for estimat- ing and expressing the precision a
4、nd bias of applicable test methods for Committee D19 on Water.1.2 Except as specified in 1.3, 1.4, and 1.5, this practice requires the task group proposing a new test method to carry out a collaborative study from which statements for precision(overall and single-operator standard-deviation estimate
5、s) and bias can be developed. This practice provides general guidance to task groups in planning and conducting such determinations of precision and bias.1.3 If a full-scale collaborative study is not technically feasible, due to the nature of the test method or instability of samples, the largest f
6、easible scaled-down collaborative study shall be conducted to provide the best possible limited basis for estimating the overall and single-operator standard deviations.1.3.1 Examples of acceptable scaled-down studies are the local-area studies conducted by Subcommittee D19.24 on microbiological met
7、hods because of inherent sample instabil- ity. These studies involve six or more completely independent local-area analysts who can begin analysis of uniform samples at an agreed upon time.1.3.2 If uniform samples are not feasible under any circum- stances, a statement of single-operator precision w
8、ill meet the requirements of this practice. Whenever possible, this state- ment should be developed from data generated by independent multiple operators, each doing replicate analyses on indepen- dent samples (of a specific matrix type), which generally fall within specified concentration ranges (s
9、ee 7.2.5.2( 3).1.3.3 This practice is not applicable to methodology involv- ing continuous sampling or continuous measurement, or both, of specific constituents and properties.1.3.4 This practice is also not applicable to open-channel flow measurements.1 This practice is under the jurisdiction of AS
10、TM Committee D19 on Water and is the direct responsibility of Subcommittee D19.02 on General Specifications,Technical Resources, and Statistical Methods.Current edition approved Aug. 10, 2003. Published September 2003. Originally approved in 1969. Last previous edition approved in 1998 as D 2777 98.
11、1.4 A collaborative study that satisfied the requirements ofthe version of this practice in force when the study was conducted will continue to be considered an adequate basis for the precision-and-bias statement required in each test method.If the study does not satisfy the current minimum requirem
12、ents for a collaborative study, a statement listing the studys deficiencies and a reference to this paragraph shall be included in the precision-and-bias statement as the basis for an exemp- tion from the current requirements.1.5 This paragraph relates to special exemptions not clearly acceptable un
13、der 1.3 or 1.4. With the approval of Committee D19 on the recommendation of the Results Advisor and the Technical Operations Section of the Executive Subcommittee of Committee D19, a statement giving a compelling reason why compliance with all or specific points of this practice cannot be achieved w
14、ill meet both ASTM requirements (1)2 and the related requirements of this practice. Precision-and- bias statements authorized by this paragraph shall include the date of approval by Committee D19.1.6 In principle, all test methods are covered by this practice.1.7 In Section 12 this practice shows ex
15、emplary precision- and-bias-statement formats for: (1) test methods yielding a numerical measure, (2) test methods yielding a non-numerical report of success or failure based on criteria specified in the procedure, and (3) test methods specifying that procedures in another ASTM test method are to be
16、 used with only insignifi- cant modifications.1.8 All studies, even those exempt from some requirements under 1.3 or 1.5, shall receive approval from the Results Advisor before being conducted (see Section 8) and after completion (see Section 13).1.9 This practice satisfies the QC requirements of Pr
17、actice D5847.1.10 It is the intent of this practice that task groups make every effort to retain all the data from their round-robin studies. Values should not be eliminated unless solid evidence exists for2 The boldface numbers in parentheses refer to the list of standards at the end of this practi
18、ce.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.1D 2777 03 their exclusion. The Results Advisor should work closely withthe task groups to effect this goal.2. Referenced Documents2.1 ASTM Standards:D 1129 Terminology Relating to Wa
19、ter3D 1141 Specification for Substitute Ocean Water4D 1193 Specification for Reagent Water3D 4375 Practice for Basic Statistics in Committee D19 onWater3D 5790 Test Method for Measurement of Purgeable Organic Compounds in Water by Capillary Column Gas Chromatography/Mass Spectrometry4D 5847 Practice
20、 for Writing Quality Control Specifications for Standard Test Methods for Water Analysis4D 5905 Practice for the Preparation of Substitute Wastewa- ter3D 6091 Practice for 99 %/95 % Interlaboratory Detection Estimate (IDE) for Analytical Methods with Negligible Calibration Error3D 6512 Practice for
21、Interlaboratory Quantitation Estimate3E 177 Practice for Use of the Terms Precision and Bias inASTM Test Methods5E 178 Practice for Dealing with Outlying Observations5E 456 Terminology Relating to Quality and Statistics5E 1169 Guide for Conducting Ruggedness Tests53. Terminology3.1 DefinitionsFor de
22、finitions of terms used in this prac- tice, refer to Terminologies D 1129, D 4375 and E 456, and Practice E 177.3.2 Definitions of Terms Specific to This Standard:3.2.1 accuracya measure of the degree of conformity ofa single test result generated by a specific procedure to the assumed or accepted t
23、rue value, and includes both precision and bias.3.2.2 biasthe persistent positive or negative deviation of the average value of a test method from the assumed or accepted true value.3.2.3 laboratorya single and completely independent ana- lytical system with its own specific apparatus, source of rea
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