Significance and Use
This guide can be used to evaluate the performance of a laboratory or group of laboratories participating in an interlaboratory proficiency test (PT) program involving petroleum and petroleum products.
Data accrued, using the techniques included in this guide, provide the ability to monitor analytical measurement system precision and bias. These data are useful for updating standard test methods, as well as for indicating areas of potential measurement system improvement for action by the laboratory. This guide serves both the individual participating laboratory and the responsible standards development group as follows:
5.2.1 Tools and Approaches for Participating Laboratories.
Flagged Data and Investigations
Data Normality Checks
Bias (Deviation from Mean)
PTP and Site Precision Comparisons
5.2.2 Tools and Approaches for Responsible Standards Development Groups.
TPI and precision trends
Bias via box & whisker plots
Relative standard deviations
Reference is made in this guide to the ASTM International Interlaboratory Cross-Check Program (ILCP) on Petroleum Products and Lubricants. Program reports containing similarly displayed results and statistical treatments may be available in other PT programs. Appendix X2 summarizes the statistical tools referenced in this guide and Appendix X3 is a collection of examples covering many of the approaches described in this guide.
1.1 This guide covers the analysis and interpretation of proficiency test (PT) program results. For participants in interlaboratory proficiency test (PT) (or crosscheck, check scheme, etc.) programs, this guide describes procedures for assessing participants' results relative to the PT program results and potentially improving the laboratory's testing performance based on the assessment findings and insights. For the committees responsible for the test methods included in interlaboratory proficiency testing programs, this guide describes procedures for assessing industry's ability to perform test methods and for potentially identifying needs for method improvement.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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