# Commission Regulation (EU) 2017/644 of 5 April 2017 laying down methods of sampling and analysis for the control of levels of dioxins, dioxin-like PCBs and non-dioxin-like PCBs in certain foodstuffs and repealing Regulation (EU) No 589/2014 (Text with EEA relevance), Division 7.3.1: Use of the lower band of the 95 % prediction interval at the decision limit of the confirmatory method

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

Cut-off value=BEQDL−sy,x×tα,f=m−21∕n+1∕m+xi−x–2∕Qxxwith:
BEQDL BEQ corresponding to the decision limit of the confirmatory method, being the ML taking into account the expanded measurement uncertainty
sy,x residual standard deviation
t α,f = m – 2 student factor (α = 5 %, f = degrees of freedom, single-sided)
mtotal number of calibration points (index j)
nnumber of repetitions on each level
xi sample concentration (in TEQ) of calibration point I determined by a confirmatory method
x–mean of the concentrations (in TEQ) of all calibration samples
Qxx=∑j=1mxi−x–2 square sum parameter
iindex for calibration point i

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Source: https://www.legislation.gov.uk/eur/2017/644/annex/III/division/7/division/7.3/division/7.3.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-644/annex-III/division-7/division-7.3/division-7.3.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.