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  • ASTM D 6708 : 2019

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material

    Available format(s):  Hardcopy, PDF

    Superseded date:  26-11-2019

    Language(s):  English

    Published date:  01-05-2019

    Publisher:  American Society for Testing and Materials

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    Abstract - (Show below) - (Hide below)

    This practice covers statistical methodology for assessing the expected agreement between two standard test methods that purport to measure the same property of a material, and deciding if a simple linear bias correction can further improve the expected agreement.

    Scope - (Show below) - (Hide below)

    1.1This practice covers statistical methodology for assessing the expected agreement between two standard test methods that purport to measure the same property of a material, and deciding if a simple linear bias correction can further improve the expected agreement. It is intended for use with results collected from an interlaboratory study meeting the requirement of Practice D6300 or equivalent (for example, ISO 4259). The interlaboratory study must be conducted on at least ten materials that span the intersecting scopes of the test methods, and results must be obtained from at least six laboratories using each method.

    1.2The statistical methodology is based on the premise that a bias correction will not be needed. In the absence of strong statistical evidence that a bias correction would result in better agreement between the two methods, a bias correction is not made. If a bias correction is required, then the parsimony principle is followed whereby a simple correction is to be favored over a more complex one.

    Note 1:Failure to adhere to the parsimony principle generally results in models that are over-fitted and do not perform well in practice.

    1.3The bias corrections of this practice are limited to a constant correction, proportional correction, or a linear (proportional + constant) correction.

    1.4The bias-correction methods of this practice are method symmetric, in the sense that equivalent corrections are obtained regardless of which method is bias-corrected to match the other.

    1.5A methodology is presented for establishing the numerical limit (designated by this practice as the between methods reproducibility) that would be exceeded about 5 % of the time (one case in 20 in the long run) for the difference between two results where each result is obtained by a different operator using different apparatus and each applying one of the two methods X and Y on identical material, where one of the methods has been appropriately bias-corrected in accordance with this practice, in the normal and correct operation of both test methods.

    Note 2:In earlier versions of this standard practice, the term “cross-method reproducibility” was used in place of the term “between methods reproducibility.” The change was made because the “between methods reproducibility” term is more intuitive and less confusing. It is important to note that these two terms are synonymous and interchangeable with one another, especially in cases where the “cross-method reproducibility” term was subsequently referenced by name in methods where a D6708 assessment was performed, before the change in terminology in this standard practice was adopted.

    Note 3:Users are cautioned against applying the between methods reproducibility as calculated from this practice to materials that are significantly different in composition from those actually studied, as the ability of this practice to detect and address sample-specific biases (see 6.7) is dependent on the materials selected for the interlaboratory study. When sample-specific biases are present, the types and ranges of samples may need to be expanded significantly from the minimum of ten as specified in this practice in order to obtain a more comprehensive and reliable between methods reproducibility that adequately cover the range of sample-specific biases for different types of materials.

    1.6This practice is intended for test methods which measure quantitative (numerical) properties of petroleum or petroleum products.

    1.7The statistical methodology outlined in this practice is also applicable for assessing the expected agreement between any two test methods that purport to measure the same property of a material, provided the results are obtained on the same comparison sample set, the standard error associated with each test result is known, and the sample set design meets the requirements of this practice, in particular that the statistical degree of freedom associated with all standard errors are 30 or greater.

    1.8This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    General Product Information - (Show below) - (Hide below)

    Committee D 02
    Document Type Standard Practice
    Publisher American Society for Testing and Materials
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    ASTM D 445 : 2019 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
    ASTM D 7094 : 2017 : REV A Standard Test Method for Flash Point by Modified Continuously Closed Cup (MCCCFP) Tester
    ASTM D 7171 : 2016 Standard Test Method for Hydrogen Content of Middle Distillate Petroleum Products by Low-Resolution Pulsed Nuclear Magnetic Resonance Spectroscopy
    ASTM D 2983 : 2019 Standard Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using a Rotational Viscometer
    ASTM D 5771 : 2017 Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels (Optical Detection Stepped Cooling Method)
    ASTM D 5580 : 2015 Standard Test Method for Determination of Benzene, Toluene, Ethylbenzene, p/m-Xylene, o-Xylene, C9 and Heavier Aromatics, and Total Aromatics in Finished Gasoline by Gas Chromatography
    ASTM D 6299 : 2019 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 2887 : 2019 : EDT 1 Standard Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography
    ASTM D 7825 : 2018 Standard Practice for Generating a Process Stream Property Value through Application of a Process Stream Analyzer
    ASTM D 8071 : 2019 Standard Test Method for Determination of Hydrocarbon Group Types and Select Hydrocarbon and Oxygenate Compounds in Automotive Spark-Ignition Engine Fuel Using Gas Chromatography with Vacuum Ultraviolet Absorption Spectroscopy Detection (GC-VUV)
    ASTM D 1319 : 2019 Standard Test Method for Hydrocarbon Types in Liquid Petroleum Products by Fluorescent Indicator Adsorption
    ASTM D 6839 : 2018 Standard Test Method for Hydrocarbon Types, Oxygenated Compounds, and Benzene in Spark Ignition Engine Fuels by Gas Chromatography
    ASTM D 2983 : 2019 : EDT 1 Standard Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using a Rotational Viscometer
    ASTM D 8210 : 2019 : REV A Standard Test Method for Automatic Determination of Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants Using a Rotational Viscometer
    ASTM D 7344 : 2017 : REV A Standard Test Method for Distillation of Petroleum Products and Liquid Fuels at Atmospheric Pressure (Mini Method)
    ASTM D 2068 : 2017 Standard Test Method for Determining Filter Blocking Tendency
    ASTM D 8183 : 2018 Standard Test Method for Determination of Indicated Cetane Number (ICN) of Diesel Fuel Oils using a Constant Volume Combustion Chamber—Reference Fuels Calibration Method
    ASTM D 8150 : 2017 Standard Test Method for Determination of Organic Chloride Content in Crude Oil by Distillation Followed by Detection Using Combustion Ion Chromatography
    ASTM D 5950 : 2014 Standard Test Method for Pour Point of Petroleum Products (Automatic Tilt Method)
    ASTM D 3828 : 2016 : REV A Standard Test Methods for Flash Point by Small Scale Closed Cup Tester
    ASTM D 4815 : 2015 : REV B Standard Test Method for Determination of MTBE, ETBE, TAME, DIPE, tertiary-Amyl Alcohol and C1 to C4 Alcohols in Gasoline by Gas Chromatography
    ASTM D 7683 : 2017 Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels (Small Test Jar Method)
    ASTM D 5769 : 2015 Standard Test Method for Determination of Benzene, Toluene, and Total Aromatics in Finished Gasolines by Gas Chromatography/Mass Spectrometry
    ASTM D 5001 : 2010 : R2014 Standard Test Method for Measurement of Lubricity of Aviation Turbine Fuels by the Ball-on-Cylinder Lubricity Evaluator (BOCLE)
    ASTM D 7170 : 2016 Standard Test Method for Determination of Derived Cetane Number (DCN) of Diesel Fuel Oils—Fixed Range Injection Period, Constant Volume Combustion Chamber Method (Withdrawn 2019)
    ASTM D 7689 : 2017 Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels (Mini Method)
    ASTM D3764:2019 Standard Practice for Validation of the Performance of Process Stream Analyzer Systems
    ASTM D 4683 : 2017 Standard Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered Bearing Simulator Viscometer at 150 °C
    ASTM D 7346 : 2015 Standard Test Method for No Flow Point and Pour Point of Petroleum Products and Liquid Fuels
    ASTM D 6550 : 2015 Standard Test Method for Determination of Olefin Content of Gasolines by Supercritical-Fluid Chromatography
    ASTM D 7215 : 2016 Standard Test Method for Calculated Flash Point from Simulated Distillation Analysis of Distillate Fuels
    ASTM D 4929 : 2017 Standard Test Method for Determination of Organic Chloride Content in Crude Oil
    ASTM D 6378 : 2018 : REV A Standard Test Method for Determination of Vapor Pressure (VPX) of Petroleum Products, Hydrocarbons, and Hydrocarbon-Oxygenate Mixtures (Triple Expansion Method)
    ASTM D 7483 : 2013 : REV A : R2017 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Oscillating Piston Viscometer
    ASTM D 7945 : 2016 Standard Test Method for Determination of Dynamic Viscosity and Derived Kinematic Viscosity of Liquids by Constant Pressure Viscometer
    ASTM D 86 : 2018 Standard Test Method for Distillation of Petroleum Products and Liquid Fuels at Atmospheric Pressure
    ASTM D 7798 : 2015 Standard Test Method for Boiling Range Distribution of Petroleum Distillates with Final Boiling Points up to 538 °C by Ultra Fast Gas Chromatography (UF GC)
    ASTM D 2887 : 2019 Standard Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography
    ASTM D 8004 : 2015 Standard Test Method for Fuel Dilution of In-Service Lubricants Using Surface Acoustic Wave Sensing
    ASTM D 7923 : 2019 Standard Test Method for Water in Ethanol and Hydrocarbon Blends by Karl Fischer Titration
    ASTM D 1319 : 2018 Standard Test Method for Hydrocarbon Types in Liquid Petroleum Products by Fluorescent Indicator Adsorption
    ASTM D 6890 : 2018 Standard Test Method for Determination of Ignition Delay and Derived Cetane Number (DCN) of Diesel Fuel Oils by Combustion in a Constant Volume Chamber
    ASTM D 7235 : 2016 Standard Guide for Establishing a Linear Correlation Relationship Between Analyzer and Primary Test Method Results Using Relevant ASTM Standard Practices
    ASTM D 7042 : 2016 : EDT 3 Standard Test Method for Dynamic Viscosity and Density of Liquids by Stabinger Viscometer (and the Calculation of Kinematic Viscosity)
    ASTM D 6756 : 2017 Standard Test Method for Determination of the Red Dye Concentration and Estimation of the ASTM Color of Diesel Fuel and Heating Oil Using a Portable Visible Spectrophotometer
    ASTM D 6377 : 2016 Standard Test Method for Determination of Vapor Pressure of Crude Oil: VPCRx (Expansion Method)
    ASTM D 6300 : 2019 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 7808 : 2018 Standard Practice for Determining the Site Precision of a Process Stream Analyzer on Process Stream Material
    ASTM D 7154 : 2015 Standard Test Method for Freezing Point of Aviation Fuels (Automatic Fiber Optical Method)
    ASTM D 7279 : 2018 Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids by Automated Houillon Viscometer
    ASTM D 5949 : 2016 Standard Test Method for Pour Point of Petroleum Products (Automatic Pressure Pulsing Method)
    ASTM D 7419 : 2018 Standard Test Method for Determination of Total Aromatics and Total Saturates in Lube Basestocks by High Performance Liquid Chromatography (HPLC) with Refractive Index Detection
    ASTM D 5188 : 2016 Standard Test Method for Vapor-Liquid Ratio Temperature Determination of Fuels (Evacuated Chamber and Piston Based Method)
    ASTM D 6792 : 2017 Standard Practice for Quality Management Systems in Petroleum Products, Liquid Fuels, and Lubricants Testing Laboratories
    ASTM D 5481 : 2013 Standard Test Method for Measuring Apparent Viscosity at High-Temperature and High-Shear Rate by Multicell Capillary Viscometer
    ASTM D 7778 : 2015 Standard Guide for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
    ASTM D 7345 : 2017 Standard Test Method for Distillation of Petroleum Products and Liquid Fuels at Atmospheric Pressure (Micro Distillation Method)
    ASTM D 409/D409M : 2016 Standard Test Method for Grindability of Coal by the Hardgrove-Machine Method
    ASTM D 8092 : 2017 Standard Test Method for Field Determination of Kinematic Viscosity Using a Microchannel Viscometer
    ASTM D 5186 : 2019 Standard Test Method for Determination of the Aromatic Content and Polynuclear Aromatic Content of Diesel Fuels By Supercritical Fluid Chromatography
    ASTM D 6591 : 2019 Standard Test Method for Determination of Aromatic Hydrocarbon Types in Middle Distillates—High Performance Liquid Chromatography Method with Refractive Index Detection
    ASTM D 4929 : 2019 Standard Test Method for Determination of Organic Chloride Content in Crude Oil

    Standards Referencing This Book - (Show below) - (Hide below)

    ASTM D 5580 : 2000 Standard Test Method for Determination of Benzene, Toluene, Ethylbenzene, p/m-Xylene, o-Xylene, C9 and Heavier Aromatics, and Total Aromatics in Finished Gasoline by Gas Chromatography
    ASTM D 6300 : 2013 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6299 : 2010 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2014 : REV A : EDT 1 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6299 : 2013 : EDT 1 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 5769 : 1998 Standard Test Method for Determination of Benzene, Toluene, and Total Aromatics in Finished Gasolines by Gas Chromatography/Mass Spectrometry
    ASTM D 5769 : 2010 Standard Test Method for Determination of Benzene, Toluene, and Total Aromatics in Finished Gasolines by Gas Chromatography/Mass Spectrometry
    ASTM D 6299 : 2017 : REV A Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6299 : 2017 : REV B Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2017 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6299 : 2009 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2017 : REV A Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6299 : 2013 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 5769 : 2010 : R2015 Standard Test Method for Determination of Benzene, Toluene, and Total Aromatics in Finished Gasolines by Gas Chromatography/Mass Spectrometry
    ASTM D 6299 : 2010 : EDT 1 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2016 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6300 : 2004 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6300 : 2019 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 5580 : 2002 Standard Test Method for Determination of Benzene, Toluene, Ethylbenzene, p/m-Xylene, o-Xylene, C9 and Heavier Aromatics, and Total Aromatics in Finished Gasoline by Gas Chromatography
    ASTM D 5580 : 2002 : R2007 Standard Test Method for Determination of Benzene, Toluene, Ethylbenzene, p/m-Xylene, o-Xylene, C9 and Heavier Aromatics, and Total Aromatics in Finished Gasoline by Gas Chromatography
    ASTM D 6299 : 2000 Standard Practice for Applying Statistical Quality Assurance Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6299 : 2010 : EDT 2 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6299 : 2016 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 7372 : 2012 Standard Guide for Analysis and Interpretation of Proficiency Test Program Results
    ASTM D 6299 : 2000 : REV A Standard Practice for Applying Statistical Quality Assurance Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2006 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6300 : 2014 : REV A Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6300 : 2015 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6300 : 1999 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 7372 : 2007 Standard Guide for Analysis and Interpretation of Proficiency Test Program Results
    ASTM D 6299 : 2008 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2013 : REV A Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6299 : 2002 : EDT 1 Standard Practice for Applying Statistical Quality Assurance Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2008 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6300 : 2003 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 5580 : 2015 Standard Test Method for Determination of Benzene, Toluene, Ethylbenzene, p/m-Xylene, o-Xylene, C9 and Heavier Aromatics, and Total Aromatics in Finished Gasoline by Gas Chromatography
    ASTM D 6300 : 2007 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6300 : 2002 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 5769 : 2004 Standard Test Method for Determination of Benzene, Toluene, and Total Aromatics in Finished Gasolines by Gas Chromatography/Mass Spectrometry
    ASTM D 6300 : 2016 : REV A Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 6299 : 2007 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6299 : 2007 : EDT 1 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 7372 : 2017 Standard Guide for Analysis and Interpretation of Proficiency Test Program Results
    ASTM D 6299 : 2017 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 6300 : 2014 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
    ASTM D 5769 : 2015 Standard Test Method for Determination of Benzene, Toluene, and Total Aromatics in Finished Gasolines by Gas Chromatography/Mass Spectrometry
    ASTM D 6299 : 2002 Standard Practice for Applying Statistical Quality Assurance Techniques to Evaluate Analytical Measurement System Performance
    ASTM D 5580 : 2013 Standard Test Method for Determination of Benzene, Toluene, Ethylbenzene, p/m-Xylene, o-Xylene, C9 and Heavier Aromatics, and Total Aromatics in Finished Gasoline by Gas Chromatography
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