Precision Estimates for AASHTO Test Method T 269 Determined Using AMRL Proficiency Sample Data (2007) / Chapter Skim
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A-1 Ellipse - 2 Std Dev for Within and Between Lab Variation Source of Data: AASHTO Materials Reference Laboratory Proficiency Sample Program Final Report Issued: August 12, 2004 Participation: 532 Total Laboratories 3 Laboratories Determined to be Invalid 21 Laboratories Determined to be Outliers 508 Total Laboratorires Included in Analysis Sample 41 Sample 42 CV% CV% Average Average (Sample 41) (Sample 42)
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A-2 Ellipse - 2 Std Dev for Within and Between Lab Variation Source of Data: AASHTO Materials Reference Laboratory Proficiency Sample Program Final Report Issued: August 16, 2005 Participation: 561 Total Laboratories 32 Laboratories Determined to be Invalid 23 Laboratories Determined to be Outliers 506 Total Laboratorires Included in Analysis Sample 43 Sample 44 CV% CV% Average Average (Sample 43) (Sample 44)
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From page 20... ...
A-3 Ellipse - 2 Std Dev for Within and Between Lab Variation Source of Data: AASHTO Materials Reference Laboratory Proficiency Sample Program Final Report Issued: August 17, 2006 Participation: 609 Total Laboratories 3 Laboratories Determined to be Invalid 28 Laboratories Determined to be Outliers 578 Total Laboratorires Included in Analysis Sample 45 Sample 46 CV% CV% Average Average (Sample 45) (Sample 46)
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