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Multi Laboratory Test – AOAC First Action Method 2012.22 Ascorbic Acid (Vitamin C) in Infant Formula and
Adult/Pediatric Nutritionals.
RDLS-RD150006
E. Campos Giménez (NRC, Lausanne)
Page 4
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Study Information,
Continued
Statistical
evaluation
After data collection, outliers were detected using Cochran and Grubbs tests.
The number and coded identity of statistical outlier laboratories are included in
this report.
Average ascorbic acid concentrations, standard deviations of repeatability (S
r
)
and relative standard deviations of repeatability (RSD
r
) were estimated from
blind duplicates in MLT samples. The duplicates were assigned to be analyzed
on the same day.
Standard deviations of reproducibility (S
R
), relative standard deviations of
reproducibility (RSD
R
), and HORRAT values (RSD
R
/predicted RSD
R
) were also
estimated.
Details on statistical analysis can be found in the “Appendix D: Guidelines for
Collaborative Study Procedures To Validate Characteristics of a Method of
Analysis” of the Official Methods of Analysis of AOAC INTERNATIONAL, 18th
Edition (2005).
AOAC OMB Meeting Book
338