# Commission Decision of 12 August 2002 implementing Council Directive 96/23/EC concerning the performance of analytical methods and the interpretation of results (notified under document number C(2002) 3044) (Text with EEA relevance) (2002/657/EC), Division: Standard deviation of the differences Di (SDi):

Extent: E+W+S+N.I.

S D1 = 2 ⋆ Σ ( D 1 2 / 7 )
When SDi is significantly larger than the standard deviation of the method carried out under within-laboratory reproducibility conditions according (see above) it is a foregone conclusion that all factors together have an effect on the result even if every single factor does not show a significant influence and that the method is not sufficiently robust against the chosen modifications.

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Source: https://www.legislation.gov.uk/eudn/2002/657/annex/chapter/3.3/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2002-657/annex/chapter-3.3/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.