Precision Estimates for AASHTO Test Method T 269 Determined Using AMRL Proficiency Sample Data (2007) / Chapter Skim
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D-1 Ellipse - 2 Std Dev for Within and Between Lab Variation Source of Data: AASHTO Materials Reference Laboratory Proficiency Sample Program Final Report Issued: September 2, 2004 Participation: 392 Total Laboratories 12 Laboratories Determined to be Invalid 22 Laboratories Determined to be Outliers 358 Total Laboratorires Included in Analysis Sample 17 Sample 18 CV% CV% Average Average (Sample 17) (Sample 18)
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From page 31... ...
D-2 Ellipse - 2 Std Dev for Within and Between Lab Variation Source of Data: AASHTO Materials Reference Laboratory Proficiency Sample Program Final Report Issued: September 1, 2005 Participation: 434 Total Laboratories 12 Laboratories Determined to be Invalid 26 Laboratories Determined to be Outliers 396 Total Laboratorires Included in Analysis Sample 19 Sample 20 CV% CV% Average Average (Sample 19) (Sample 20)
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From page 32... ...
D-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 28, 2006 Participation: 480 Total Laboratories 11 Laboratories Determined to be Invalid 33 Laboratories Determined to be Outliers 436 Total Laboratorires Included in Analysis Sample 21 Sample 22 CV% CV% Average Average (Sample 21) (Sample 22)
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