# Commission Decision of 18 December 2009 adopting a multiannual Community programme for the collection, management and use of data in the fisheries sector for the period 2011-2013 (notified under document C(2009) 10121) (2010/93/EU), Division 4: Where reference is made to precision/confidence level the following distinction shall apply:

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

(a) Level 1 level making it possible to estimate a parameter either with a precision of plus or minus 40 % for a 95 % confidence level or a coefficient of variation (CV) of 20 % used as an approximation;
(b) Level 2 level making it possible to estimate a parameter either with a precision of plus or minus 25 % for a 95 % confidence level or a coefficient of variation (CV) of 12,5 % used as an approximation;
(c) Level 3 level making it possible to estimate a parameter either with a precision of plus or minus 5 % for a 95 % confidence level or a coefficient of variation (CV) of 2,5 % used as an approximation.

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Source: https://www.legislation.gov.uk/eudn/2010/93/annex/chapter/II/division/B/division/4 (the official version)
Page: https://openlegislation.uk/eu-decision-2010-93/annex/chapter-II/division-B/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.