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  • ASTM
    D6617-13 Standard Practice for Laboratory Bias Detection Using Single Test Result from Standard Material
    Edition: 2013
    $103.58
    Unlimited Users per year

Description of ASTM-D6617 2013

ASTM D6617 - 13

Standard Practice for Laboratory Bias Detection Using Single Test Result from Standard Material

Active Standard ASTM D6617 | Developed by Subcommittee: D02.94

Book of Standards Volume: 05.03




ASTM D6617

Significance and Use

4.1 Laboratories performing petroleum test methods can use this practice to set an acceptable tolerance zone for infrequent testing of CS or CCS material, based on ?, and a desired Type I error, for the purpose of ascertaining if the test method is being performed without bias.

4.2 This practice can be used to estimate the power of correctly detecting bias of different magnitudes, using the acceptable tolerance zone set in 4.1 , and hence, gain insight into the limitation of the true bias detection capability associated with this acceptable tolerance zone. With this insight, trade-offs can be made between desired Type I error versus desired bias detection capability to suit specific business needs.

4.3 The CS testing activities described in this practice are intended to augment and not replace the regular statistical monitoring of test method performance as described in Practice D6299 .

1. Scope

1.1 This practice covers a methodology for establishing an acceptable tolerance zone for the difference between the result obtained from a single implementation of a test method on a Check Standard (CS) and its ARV, based on user-specified Type I error, the user-established test method precision, the standard error of the ARV, and a presumed hypothesis that the laboratory is performing the test method without bias.

Note 1 Throughout this practice, the term user refers to the user of this practice; and the term laboratory (see 1.1 ) refers to the organization or entity that is performing the test method.

1.2 For the tolerance zone established in 1.1 , a methodology is presented to estimate the probability that the single test result will fall outside the zone, in the event that there is a bias (positive or negative) of a user-specified magnitude that is deemed to be of practical concern (that is, the presumed hypothesis is not true).

1.3 This practice is intended for ASTM Committee D02 test methods that produce results on a continuous numerical scale.

1.4 This practice assumes that the normal (Gaussian) model is adequate for the description and prediction of measurement system behavior when it is in a state of statistical control.

Note 2 While this practice does not cover scenarios in which multiple results are obtained on the same CS under site precision or repeatability conditions, the statistical concepts presented are applicable. Users wishing to apply these concepts for the scenarios described are advised to consult a statistician and to reference the CS methodology described in Practice D6299 .


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D2699 Test Method for Research Octane Number of Spark-Ignition Engine Fuel

D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance

E178 Practice for Dealing With Outlying Observations


Keywords

accepted reference value; bias; check standard; consensus; power of test; probability of bias detection; type I error; type II error;


ICS Code

ICS Number Code 19.020 (Test conditions and procedures in general)


DOI: 10.1520/D6617

ASTM International is a member of CrossRef.

ASTM D6617

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